This profile reflects public professional-association directory records observed by Vasari through Aug 26, 2026. Verify credentials, services, and availability directly with the source association. Inclusion is not a Vasari endorsement.
About
Mary Kohnke serves as Consignment Director in the Rare Books department at Heritage Auctions, bringing more than 15 years of expertise in rare books, manuscripts, and archival collections. She joined Heritage following an accomplished career as Director of Rare Books and Manuscripts at Leslie Hindman Auctioneers (2008–2016), and as the founder of Ex Libris Appraisals, a private appraisal firm specializing in archives and collections of historical significance.Mary holds a B.A. in Classics from Valparaiso University and an M.A. in Art History from the University of Notre Dame. She is a Certified Member of the Appraisers Association of America and is recognized for her rigorous scholarship, research-based approach, and deep understanding of the rare book and manuscript market.Throughout her career, Mary has worked with a wide range of material—from early printed books and illuminated manuscripts to institutional archives and collections of cultural heritage—helping clients preserve, evaluate, and present important pieces of history.