Her clients include the industry's top collectors, dealers, galleries, charitable organizations, artists, auction houses and museums. In addition, Diana advises high-net-worth individuals and their families on art transactions and maintenance, tax, trust and estate planning matters associated with their art. Art is a unique asset, which presents challenging valuation and family relationship issues that Diana is particularly sensitive to when working with cli¬ents. Diana also advises art businesses on all aspects of their transactions, operations and global expansion. She assists artists with their legacy planning and gallery representation. 

As a forward thinker, Diana represents clients on many groundbreaking developments that are changing the land¬scape of the art market, including technology and art and the parallels of fashion and art. She is the co-author of the Fifth Edition of Art Law: The Guide for Collectors, Investors, Dealers & Artist and is a frequent speaker on a variety of issues affecting the art market. An established media commentator, Diana has been quoted in numerous news outlets, including The New York Times, CNN, Bloomberg Business, BBC, as well as having written articles for various publications including Forbes, Trusts & Estates, for which she sits on the editorial board, Crain's, and Wealth Management.

Diana has been globally recognized by Chambers as one of the leading Band 1 lawyers in Art and Cultural Property Law since the category's inception 5 years ago, and she is highly regarded for her advice. One source says "She would be at the top of any list. She has long-standing expertise and contacts within the art world," and adds: "She handles some of the biggest deals for collectors and is highly respected by auction houses and galleries." Another states: "She is a born leader - really smart, really knowledgeable, and has great expertise in the tax space. She can handle everything. " Additionally, Diana has been named by ARTnews as one of the Top 75 Art Professionals of 2023, she has also been recognized as one of Crain's New York Business' Notable Women in Law for 2022, and she has been named a "New York Trailblazer" by the New York Law Journal in 2020.

As a contributor to the art and legal community, Diana serves as Co-chair of the Appraisers Association of America's Art Law Day, served as Chair of the New York City Bar Association's Art Law Committee from 2019 to 2022, as Chair of the American Bar Association's Art and Collectibles Committee, on the Professional Advisory Council of the Metropolitan Museum of Art, on the Board of Trustees for Art21, on the Planned Giving Advisory Council of the New York Historical Society and as a member of the ArtTable Circle.