For building a modern or contemporary photography collection, choose Diana Poole Art Advisory when you want a photography specialist who handles acquisition, management and curation and who has strong gallery and artist networks in London, Zürich and New York. For corporate or high-end portfolios, consider Chandos Dodson Epley (C2) or veteran advisors like Barbara Guggenheim.
3Diana Poole Art AdvisoryBest when you need a photography specialist for acquiring, managing and curating modern/contemporary photo collections; notable London–Zürich–New York networks and deep photography expertise.27%
When building a contemporary photography collection, working with a specialist who understands the distinct nuances of the photographic market—such as edition sizes, vintage versus modern prints, condition reporting, and archival permanence—is essential.
While many top-tier general contemporary art advisors handle photography as part of a broader roster, a select group of specialists and boutique firms focus deeply on the medium.
Ralph DeLuca (New York) - Widely recognized in high-end collecting circles, DeLuca is a prominent contemporary art and photography advisor known for working with high-profile private collectors, major institutions, and enterprise collections like MGM Resorts. He has a sharp eye for exceptional historical and contemporary photographs.
Tristan Lund (London / International) - An independent curator and advisor who specializes specifically in photography. Lund brings extensive institutional and commercial experience—including his background with Michael Hoppen Contemporary and as a curator for The Incite Project and Photo London. He advises private collectors on buying and selling modern and contemporary photo-based art, photojournalism, and documentary work.
Simone Klein (Cologne / Europe) - Operating Simone Klein Photography & Art Advisory , Klein is a globally recognized specialist with three decades of market experience. Her resume includes heading the photographs departments at Sotheby's (Europe) and , serving as Global Sales Director for Magnum Photos, and working with . She offers deep expertise in navigating 19th-century through contemporary photography acquisitions.
Heather James Art Advisory (Palm Springs, New York, Jackson Hole) - Led by industry veterans with extensive market tenure, this firm offers white-glove advisory services across broad spectrums of fine art, with strong capabilities in sourcing museum-quality post-war and contemporary photographs alongside masterworks.
Meredith Darrow (Los Angeles) - While operating as a broader contemporary art advisor (noted for shaping major collections and working with high-profile clientele), Darrow's extensive gallery background and deep market access make her a powerful guide for collectors integrating ambitious, large-scale contemporary photo and lens-based works into private portfolios.
To help narrow down who might be the absolute best fit for your vision, could you share:
What is your geographic focus or preference (e.g., US-based vs. European advisors)?
Are you focusing on pure contemporary work (emerging/mid-career) , or looking to mix in 20th-century masters?
If by “leading” you mean well-established advisors with unusually deep photography expertise, rather than simply large generalist art consultants, I’d put the following names on a serious shortlist. There is no authoritative ranking of art advisors, so I’m weighting photography specialization, collecting experience, institutional/market credentials, and independence rather than treating “leading” as a formal ranking.
Advisor
Base
Photography depth
Particularly relevant if…
Diana Poole
Zürich
Very high
You want a photography-first advisor with international gallery, museum and auction relationships
Ariel Meyerowitz
New York
Very high
You want deep expertise in contemporary + vintage photography and hands-on collection building
Shane Lavalette / Lavalette
U.S.
Very high
You want contemporary photography, emerging artists, commissions and curatorial projects
Lela Hersh / Museum & Fine Arts Consulting
Chicago
Very high
You want a museum-quality collection with rigorous research, appraisal and collection management
Megan Fox Kelly
New York
High
Photography is part of a broader Post-War/contemporary collection and you want sophisticated estate/collection management
Christopher Barton
Boston
High
You want a scholarly, historically grounded collection spanning photography and other media
Doyle Wham Advisory
London
High, with a specialty
You are particularly interested in African, Caribbean and diasporic photography
Chelsea Art Group
New York
High
You want photography integrated into a larger contemporary-art strategy
The photography specialists I'd investigate first
Diana Poole is probably the most obvious specialist to interview if the collection is going to be primarily contemporary photography. Her practice is explicitly dedicated to photographic art, covering acquisition, collection management and presentation. Before establishing her own practice in 2013, she worked with photography galleries in London, Zürich and New York, including Magnum Photos and Edwynn Houk Gallery, and she has relationships with artists, galleries, auction specialists and museum curators.
Ariel Meyerowitz is another particularly interesting choice. She has more than 30 years in contemporary art and photography and founded her advisory in 2006. Before that, she ran her own photography gallery and worked at James Danziger Gallery. Her advisory covers both contemporary and vintage photography, including acquisition, provenance, condition, negotiation, framing, installation and collection management.
Shane Lavalette / Lavalette is worth a look if you're interested in younger and mid-career contemporary photographers rather than primarily blue-chip historical photography. Lavalette describes itself as a contemporary art advisory and creative studio specializing in photography, advising private collectors and companies on acquisitions of established, mid-career and emerging artists as well as commissions, publications and exhibitions.
Lela Hersh stands out because the photography expertise is paired with serious museum and appraisal credentials. Her firm specifically focuses on international modern, contemporary and photography markets. Hersh previously spent 20 years at the Museum of Contemporary Art Chicago, including as Director of Collections and Exhibitions, has an MFA in photography, and works as an advisor, curator, researcher and appraiser.
Megan Fox Kelly is broader rather than photography-first, but she's a substantial name if you expect the collection to expand beyond photography. Her practice has advised collectors for more than 25 years and covers Post-War/contemporary art, vintage and contemporary photography, acquisitions, sales, appraisals, estates and collection management. She is a former president of the Association of Professional Art Advisors.
Christopher Barton is an interesting alternative for a more scholarly collection. The Association of Professional Art Advisors says his expertise includes the history of photography alongside modern and contemporary art, and describes his work as helping collectors create cohesive collections through research, acquisition advice and strategic guidance.
A specialist angle worth considering
If your interests include African, Caribbean and diasporic photography, Doyle Wham Advisory deserves a separate conversation. Its advisory specifically focuses on modern/contemporary art and photography from Africa, the Caribbean and the diaspora, while also offering collection management, conservation, cataloguing and framing guidance.
I'd separate these advisors from photography dealers/galleries and auction specialists. An advisor working exclusively for the collector can help you determine what to buy, from whom, at what price, and how the works fit into a coherent collection. That's particularly valuable in photography because edition size, print date, printing method, provenance, condition, paper, size and later editions can materially affect both significance and price.
The Association of Professional Art Advisors (APAA) is also a useful starting point because its directory can be filtered specifically for Photography + Post-War and Contemporary + Acquisitions/Collection Management.
If you tell me roughly what you want to spend—e.g. $250k, $1M, $5M+—and whether you're interested in emerging photographers, blue-chip contemporary (Sherman, Gursky, Sugimoto, Tillmans, etc.), fashion photography, or a museum-quality historical/contemporary mix, I can narrow this to 5–7 advisors who are genuinely appropriate for that collecting strategy, including their geographic reach and notable areas of expertise.
For a contemporary photography collection, the strongest art advisors tend to fall into two groups: photography specialists (best if photography is the core of the collection) and broader contemporary-art advisors with deep photography experience (best if photography will sit alongside painting, sculpture, video, etc.). There is no single universally “leading” advisor; fit depends on the collector’s goals, budget, geography, and collecting thesis.
Conservation and installation: framing, storage, light exposure, insurance.
Institutional context: museums, curators, and scholarship.
The Association of Professional Art Advisors maintains a directory where collectors can filter advisors by specialty, including photography, acquisitions, collection management, and geographic region.
If you are building a $100k, $1M, or $10M+ photography collection, the shortlist would look quite different; budget level and whether you want emerging artists vs. blue-chip names (e.g., Sugimoto, Sherman, Gursky, Demand, Prince, Tillmans) materially changes who I would contact.
Building a contemporary photography collection requires an advisor who understands the nuanced intersections of edition sizes, vintage versus modern prints, archival stability, and the rapidly shifting contemporary market. While many general contemporary art advisors handle photography, a select group of specialists and boutique firms focus deeply on the medium.
Leading professionals and specialists known for navigating the contemporary photography landscape include:
Diana Poole (Diana Poole Art Advisory ): Based in London with an international footprint, Poole specializes in modern and contemporary photography. Having worked as a director and curator for major photography galleries across London, Zürich, and New York, she assists private clients with acquisitions, collection management, and market strategy.
Mary Ann Prior : A prominent curator and advisor with deep institutional and corporate experience. Formerly the curator for the prestigious Wilson Centre for Photography in London and an associate curator of photographs at the Getty Museum , Prior brings museum-level curation and deep historical rigor to private and corporate collections.
Ralph DeLuca (Ralph DeLuca Art Advisory ): Operating out of New York, DeLuca is a high-profile contemporary art and photography advisor who works with major collectors, high-profile figures, and corporate entities like MGM Resorts. He is known for high-level access to blue-chip primary and secondary markets and has lent his expertise to institutions like LACMA.
Christopher Barton (APAA Directory ): A specialist member of the Association of Professional Art Advisors (APAA) who combines advisory work with an extensive background in the history of photography. He is particularly favored by collectors looking to synthesize photography into a broader, multi-era contemporary collection while navigating complex provenance and cross-border transactions.
Specialized Galleries Acting as Private Advisors : Many top-tier commercial photography galleries—such as Yossi Milo (New York), Fraenkel Gallery (San Francisco), and Pace/MacGill (historical-to-contemporary)—frequently operate in an advisory capacity for collectors, helping source rare contemporary works directly from artists or private estates.
If you'd like to narrow this down, tell me:
What is your geographic focus or preferred location for meetings?
Are you looking for emerging contemporary photographers or established blue-chip/post-war masters of the medium?
I can help tailor recommendations or outline the initial steps to take before your first consultation.
If your goal is specifically to build a serious contemporary photography collection, rather than a general contemporary-art collection that happens to include photography, I’d start with specialists whose careers are deeply rooted in photography.
A useful shortlist:
Diana Poole — Zürich / international. Probably one of the clearest fits for a photography-led collection. Her practice is specifically devoted to modern and contemporary photographic art, covering acquisition, collection management and presentation. Before establishing her advisory, she worked with Flowers, Atlas/Magnum Photos, Edwynn Houk Gallery and international photography fairs.
Ariel Meyerowitz Art Advisory — New York. Meyerowitz has more than 30 years in contemporary art and photography and advises on both contemporary and vintage photography as well as other media. Her positioning is particularly relevant if you want photography to be the core but don't want the collection confined to one medium.
Lavalette / Shane Lavalette — New York. An unusually photography-specific advisory and creative practice. Lavalette advises private collectors and companies on established, mid-career and emerging photographers and also handles commissions, exhibitions and publishing.
Tristan Lund — London / international. A curator and advisor specializing in photography, with experience as director of Michael Hoppen Contemporary and curator of the Incite Project collection. He works with private collectors on acquisitions from artists, galleries and auction houses, with particular exposure to documentary, photojournalistic and contemporary photographic work.
Arts & Business Partners — U.S./Europe. A more collector-oriented option: the firm says it has placed 250+ photographs in private collections, works across vintage and contemporary photography, and conducts due diligence on print dates, provenance and condition.
Christopher Barton Fine Art Advisory — Boston/Cambridge. Broader than the specialists above, but specifically cites expertise in the history of photography alongside modern and contemporary art. He also emphasizes building a cohesive collection across different media and geographic traditions.
Megan Fox Kelly — New York. A veteran generalist advisor with museum/curatorial training who has built collections spanning Post-War and Contemporary art and vintage and contemporary photography.
How I'd distinguish them
If you want…
Advisors worth investigating
Photography as the central collecting discipline
Diana Poole, Ariel Meyerowitz, Shane Lavalette, Tristan Lund
Emerging + mid-career photographers
Lavalette, Diana Poole, Tristan Lund
Contemporary photography + broader contemporary art
Ariel Meyerowitz, Megan Fox Kelly, Christopher Barton
There is also a useful professional filter: the Association of Professional Art Advisors (APAA) directory lets you search specifically for advisors by Photography, Post War and Contemporary, Acquisitions, Collection Management, geography, etc.
One important caveat: “leading” isn't a standardized designation in art advisory—there's no licensing system or objective league table. CULTURED's 2026 Power Advisor list, for example, identifies prominent contemporary-art advisors, but prominence in general contemporary art doesn't necessarily translate into expertise in photography.
If you tell me roughly your collecting budget (e.g. $250k, $1M, $5M+), whether you're interested in emerging vs. established photographers, and whether you're U.S.- or Europe-based, I can narrow this to 5 advisors whose actual specialties and networks fit that collecting brief.
When building a contemporary photography collection, finding an advisor with specific expertise in the medium is essential. Unlike general contemporary art, photography requires a deep technical and historical understanding of print processes, edition sizes, vintage versus modern prints, conservation, and distinct secondary market dynamics.
Rather than a single universal "best," the leading figures and independent specialists operating in the contemporary photography advisory space include high-profile independent experts, former auction house heavyweights, and boutique advisory firms:
Simone Klein (Simone Klein Photography & Art Advisory ): Based in Europe with a global reach, Klein is one of the most prominent independent photography specialists and advisors worldwide. With a 30-year career that includes heading the photography departments at Sotheby’s (Europe) and Lempertz, as well as serving as Global Sales Director for Magnum Photos, she advises major private collections and institutions on 19th-century through contemporary works.
Fine Art Brokers (Fine Art Brokers ): Led by principals including Ray Waterhouse , this international advisory and brokerage team explicitly specializes in guiding high-net-worth clients through acquiring and structuring multi-million-dollar collections that feature contemporary photography alongside modern and post-war masters.
Hannah Sloan (Hannah Sloan Curatorial & Advisory ): Known for bridging the gap between emerging/mid-career contemporary artists and private/public collections, Sloan brings a rigorous background in contemporary art history and fine art photography, assisting collectors with acquisitions, curation, and collection management.
Julie Grahame (Julie Grahame Consulting ): Operating out of New York with over 30 years in the fine art photography trenches (including stints running photo agencies and working with galleries like ClampArt), Grahame works extensively with private clients, estates, and photographers on portfolio evaluation, market navigation, and deep-dive collection strategy.
Major Auction House Advisory Services (Sotheby’s, Christie’s, Phillips): For heavy-duty acquisitions, many top-tier collectors bypass independent boutique advisors and instead utilize the private sales and dedicated private client groups within the major auction houses' photography divisions. They offer discreet global access to top-tier private contemporary photo collections (e.g., works by Cindy Sherman, Andreas Gursky, Hiroshi Sugimoto, or Wolfgang Tillmans).
Note on Selection: When vetting an advisor for photography specifically, it is always wise to check if they are vetted members of the Association of Professional Art Advisors (APAA) , which sets strict ethical and professional standards for market transparency.
To help narrow down who might be the absolute best fit for you, let me know:
What is your geographic focus (US, Europe, Asia)?
Are you targeting emerging contemporary photographers or blue-chip established masters of the medium?
What is your approximate budget range or collecting scope?
If by “art advisor” you mean an independent advisor who can help you build a serious contemporary photography collection—rather than simply source individual photographs—I’d look particularly closely at specialists with deep photography expertise, museum/curatorial relationships, and access to both primary and secondary markets.
A useful shortlist:
Ariel Meyerowitz / Ariel Meyerowitz Art Advisory — One of the most directly relevant names. Meyerowitz has more than 30 years in contemporary art and photography and advises on both contemporary and vintage photography, as well as broader collections. Her practice emphasizes building coherent collections rather than simply buying individual works.
Diana Poole / Diana Poole Art Photography — Particularly interesting if photography itself is the center of the collection. Poole specializes exclusively in photography, working with private and corporate collectors on acquisition, management and presentation. Her background includes Flowers, Atlas/Magnum Photos and Edwynn Houk Gallery, and she has worked extensively across London, Zürich and New York.
Shane Lavalette / Lavalette — An unusual hybrid of advisor, curator, publisher and creative studio. Lavalette advises collectors on established, mid-career and emerging photographers and has facilitated acquisitions, commissions, exhibitions and publications. This could be especially useful for someone wanting a collection with a strong curatorial point of view, rather than a conventional blue-chip portfolio.
Juliet Rees Davies / Rees Davies Art Advisory — Broader contemporary-art expertise, but explicitly includes photography and works across both primary and secondary markets. Worth considering if photography will be a major component of a collection that also includes painting, sculpture or other contemporary media.
Allan Schwartzman — A heavyweight independent advisor with decades of experience in building significant collections. He appears in the Association of Professional Art Advisors' directory under photography and postwar/contemporary collecting. His practice is broader than photography, so I'd consider him particularly for a museum-quality contemporary collection in which photography is one major pillar.
Art Intelligence Global (AIG) — Founded by Sotheby's veterans Amy Cappellazzo and Yuki Terase, AIG is one of the prominent high-end global advisory firms. Its expertise is much broader than photography, but it brings substantial market intelligence, international sourcing and collection strategy, particularly with an Asian-market dimension.
If photography is the core of the collection
I'd start conversations with Diana Poole, Ariel Meyerowitz, and Lavalette. They represent three somewhat different approaches:
Advisor
Particularly relevant if you want…
Diana Poole
A photography-first collection with serious historical + contemporary depth
Ariel Meyerowitz
Photography integrated into a sophisticated broader contemporary collection
Lavalette
Emerging/mid-career artists, contemporary photography and a strong curatorial narrative
Allan Schwartzman
A large, museum-caliber contemporary collection extending beyond photography
One important point: “leading” isn't necessarily the same thing as “best for your collection.” The advisor's own aesthetic, willingness to buy emerging artists, gallery relationships, geographic reach, and fee/transaction structure can matter enormously. The Association of Professional Art Advisors lets you filter advisors specifically by Photography + Post War and Contemporary + Acquisitions/Collection Management, which is a useful way to expand the field beyond the most publicized names.
If you tell me roughly (1) budget—e.g. $250k, $1M, $5M+, (2) U.S. vs. international, and (3) whether you want established blue-chip photographers or emerging artists, I can narrow this to a much more targeted shortlist of 5–10 advisors and explain the particular niche each one occupies.
When building a high-level contemporary photography collection, collectors typically look to specialized private art advisors, independent curators, and former gallery directors who possess deep technical, historical, and market-access expertise specific to the medium. Unlike general contemporary art advisors, photography advisors understand edition management, vintage versus modern prints, archival stability, and the nuances of the secondary photo market.
Prominent and respected independent figures and practices specializing in or heavily recognized for advising on modern and contemporary photography collections include:
Diana Poole (Founder of Diana Poole Art Advisory, based in London/UK) — A recognized member of the Association of Professional Art Advisors (APAA) , Poole has a rich background directing and curating for leading international photography galleries. She works closely with private and corporate clients to build deeply considered, museum-quality contemporary and fashion-focused photography collections.
Simone Klein (Simone Klein Photography & Art Advisory, based in Cologne/Germany) — With a 30-year career spanning major auction houses (such as Sotheby's) and prestigious galleries, Klein is a publicly sworn and appointed expert for 19th- to 21st-century photographs. She is widely sought after by major international institutions and high-net-worth private collectors.
Matthieu Humery (Independent Curator & Photography Advisor) — Known globally for his high-profile work with major institutional and private holdings (including advisory roles tied to the Pinault Collection ), Humery specializes in large-scale contemporary and 20th-century photographic narratives and major collection builds.
Meredith Darrow (Meredith Darrow Art, based in Los Angeles) — Though she advises across broader contemporary genres, Darrow is a prominent high-tier market advisor who cut her teeth building buzzy, critically acclaimed collections (such as for the late Rosa de la Cruz) and navigating top-tier auction and primary markets for blue-chip modern and contemporary works.
Hemphill Artworks / Advisory (Based in Washington, D.C.) — Led by Hemphill , this practice has a long-standing reputation for multidimensional acquisition strategies spanning modern, historic, and contemporary photography, balancing rigorous architectural placement with long-term investment acclaim.
To help narrow down who might be the absolute best fit for your goals, could you share:
Your geographic focus (US, Europe, Asia)
Whether your interest leans toward emerging contemporary lens-based artists or established 20th-century masters
The scale of the collection (residential, corporate, or museum-level)
If your goal is to build a serious contemporary photography collection—not simply buy attractive photographs—I’d prioritize advisors with deep photography expertise, rather than generalist art consultants. I’d put the following on a first-call list:
My shortlist
Ariel Meyerowitz — Ariel Meyerowitz Art Advisory
Probably one of the strongest U.S. choices for a photography-led collection. Meyerowitz has 30+ years in contemporary art and photography, advises on both contemporary and vintage photography, and explicitly works on building coherent, long-term collections. Ariel Meyerowitz Art AdvisoryBest for: a sophisticated private collector who wants photography to be the core of the collection.
Diana Poole — Diana Poole Art Advisory
An unusually photography-specific practice. Poole advises private and corporate collectors on modern and contemporary photographic works and has relationships with photographers, galleries, auction specialists and museum curators. Diana PooleAssociation of Professional Art AdvisorsBest for: someone who wants photography expertise rather than a general contemporary-art advisor.
Megan Fox Kelly — Megan Fox Kelly Art Advisory
A particularly strong choice if you want photography within a broader museum-quality collection. Her background includes the National Gallery of Art, and she has curated collections spanning Post-War/Contemporary art as well as vintage and contemporary photography. She is also a former president of the Association of Professional Art Advisors. Megan Fox KellyBest for: building a substantial, historically grounded collection rather than a narrowly photography-only one.
Christopher Barton — Chris Barton Fine Art Advisory
Particularly interesting if you care about scholarship, provenance and intellectual coherence. Barton explicitly lists the history of photography among his areas of expertise and advises on building collections of lasting interest and value. Association of Professional Art AdvisorsBest for: a collector who wants rigorous research and a collection with a strong intellectual thesis.
Lela Hersh — Museum and Fine Arts Consulting
A fascinating option because Hersh spent almost 20 years at the Museum of Contemporary Art Chicago, including as Director of Collections and Exhibitions, and has an MFA in photography. Her advisory practice specifically covers modern, contemporary and photography markets. Association of Professional Art AdvisorsBest for: a museum-minded collector interested in photography's art-historical context.
Wendy Cromwell — Wendy Cromwell
One of the established names in U.S. independent art advisory. She's a broader contemporary specialist rather than a photography-only advisor, but that can be an advantage if you expect the collection eventually to encompass painting, sculpture, video, etc. She appears on CULTURED's 2026 Power Advisor list. Cultured MagBest for: photography as one component of a major contemporary collection.
One more I would investigate
Chelsea Art Group is worth considering as a firm rather than an individual. It's a long-established independent New York advisory that explicitly works across photography, conceptual art, painting, drawing and sculpture, with both primary- and secondary-market acquisitions.
The Association of Professional Art Advisors (APAA) directory is also useful because you can filter advisors by Photography + Post-War/Contemporary + Acquisitions, rather than relying on generic "top art advisor" lists.
How I'd narrow it down
If I were interviewing advisors for a $1–5M contemporary photography collection, my first four conversations would probably be:
Ariel Meyerowitz → Diana Poole → Megan Fox Kelly → Christopher Barton.
I'd ask each of them to propose a hypothetical first-year acquisition plan—not specific works necessarily, but 20–30 artists they'd want me to study, the balance between established/emerging artists, primary vs. secondary market, vintage vs. contemporary, and how they'd think about the collection's eventual curatorial thesis.
That exercise will tell you much more than reputation alone. The best advisor should be able to explain why the collection should exist, not merely which photographs are expensive or fashionable.
If you tell me your approximate budget (e.g. $250k, $1M, $5M+), whether you're NY/London/Europe-based, and whether you mean strictly photography or contemporary art with photography as the centerpiece, I can give you a much tighter top 5 with strengths, weaknesses, likely client profile, and who I'd approach first.
When building a contemporary photography collection, collectors typically look to advisors who specialize explicitly in the medium, or top-tier contemporary art advisory firms with deep fluency in photo-based art, conceptual photography, and the secondary/primary photo market.
Prominent independent specialists and high-profile advisory practices known for handling contemporary photography and lens-based art include:
Tristan Lund — An independent art advisor based in the UK who specifically specializes in international photography. He is the curator of The Incite Project (a major private collection of documentary and photojournalistic art) and serves on committees for Photo London and Frieze Masters. He brings a deep background from leading galleries like Michael Hoppen Contemporary.
Aline Smithson / Photo-Specific Consultants — While many major multi-genre advisory heavyweights (like Schwartzman& or Cromwell Art ) handle photography alongside other contemporary media for high-net-worth clients, serious photo collectors often utilize boutique consultants who have spent decades inside major photography houses (such as former senior specialists from Phillips, Christie's, or Sotheby's photography departments).
Ocula Advisory — Operating globally, Ocula Advisory taps into networks across major commercial galleries and auction houses to source contemporary works, frequently assisting collectors in navigating the acquisition of contemporary lens-based and mixed-media works.
Hannah Sloan Curatorial & Advisory (HSC&A) — Known for bridging deep contemporary art history with a specific emphasis on contemporary photography, helping collectors source from emerging and mid-career image-makers.
Association of Professional Art Advisors (APAA) — Though not a single advisor, checking the APAA Directory is the gold standard for finding vetted, independent, conflict-free advisors who list photography and contemporary prints as their primary specialties.
If you want to narrow this down, let me know:
Are you focusing on historical/masterworks (like vintage gelatin silver prints) or strictly ultra-contemporary/conceptual photography?
What is your preferred geographic region for sourcing (US, Europe, Asia)?
