Jonah Rosenberg serves as President of the Society. He is Head of Rare Books at Arader Galleries (https://www.araderbooks.com/) in New York, where his work focuses on maps, rare books, and other works on paper. He holds an A.B. in Classics from Brown University and a D.Phil. in Classical Archaeology from the University of Oxford. Jonah is a member of the International Council of Museums and the Grolier Club, and brings a strong scholarly background and professional experience to his leadership of the Society.

Marcos Baer has a passion for NYC pictorial maps, including posters, graphic design history, and publishing history. Professionally, he is the president of Portada, a trade publication and knowledge-sharing platform for marketers in the U.S. and Latin America. Prior to launching Portada in 2003, Marcos worked in both the media and finance sectors. He held executive roles at the Spanish edition of The Wall Street Journal, at Spain’s newspaper Cinco Dias, and at Swiss Re. He is an MBA and a CFA.

Stephen Banker has been Treasurer of The New York Map Society since 2015. Steve developed an affinity for old maps as a child and has been collecting for over 35 years. His interest is primarily in maps from the 1400’s through the 1600’s, with a focus on world maps, maps of the Northeast U.S., maps of the Holy Land and any other maps with a particular beauty or historical interest. He is a member of three other map societies. Steve has developed educational programs for Nursery School and Elementary School students, utilizing maps to explore science, history, geology, geography, humor, art and many other disciplines. Steve is also involved with other not-for-profit organizations: for 26 years he was a Trustee and volunteer with The Educational Alliance, a 125-year-old multi-generational community service organization with over 15 facilities on the Lower East Side and East Village, serving over 50,000 New Yorkers every year; he remains an Honorary Trustee. He also serves as President of Westchester Harmony, one of the leading barbershop choruses in the country, where he sings bass. Steve has retired from his partnership in the international law firm, Skadden, Arps, Slate, Meagher & Flom, LLP, where he practiced for 34 years, specializing in mergers and acquisitions. He has a B.A. from Cornell University and a J.D. from the University of Pennsylvania.

In 2010 Andrew Kapochunas retired from decades as a consumer and business data/processing consultant — including at Dun & Bradstreet, where he was awarded patents for domestic and global address maintenance. Prior to that, after graduating from Stuyvesant High School and the City College of New York with a degree in Biological Illustration, he spent 13 years in publishing, becoming Editor-in-Chief and Associate Publisher of multiple magazines. In 1988 he began collecting antique maps of the area of the Polish-Lithuanian Commonwealth, and in 2008 built his site https://www.lithuanianmaps.com/, which, went it went static in 2021 (because its platform ceased to be updatable) had 4,330 high-definition downloadable images. The images and text on that still active site were transferred in 2024 to one hosted by the Lithuanian Cartographic Society: https://lietuvoskartografija.lt/lithuanianmaps/, with financial support from Lithuania’s Ministry of Foreign Affairs, which considers it a national resource. He became Secretary of the New York Map Society in 2014 and soon began partnering with Steve Hanon and Laura Ten Eyck in society membership and program development. He began giving map-related presentations in 2013 at venues such as Seton Hall University and the New York Public Library, and to in-person and Zoom audiences ranging from map society members, genealogical groups, and UN ambassadors interested in the historical relationship of their countries to Lithuania.

Stephen Hanon is a collector and student of historical cartography whose interests include the Age of Discovery, Spanish mapping (informed by the five years he lived in Spain), Colonial America, early New York City, and the cartographic record of St. Louis and westward expansion. His work as a collector reflects a sustained engagement with the historical, geographic, and cultural contexts in which maps were produced. He served as President of the New York Map Society from 2016 to 2025 and is a member of the Executive Committee of the International Map Collectors’ Society (IMCoS) in London. He is also a member of the Philip Lee Phillips Society at the Library of Congress and other cartographic organizations. In 2023, he was elected a Fellow of the Royal Geographical Society. Professionally trained in finance, strategy, and operations, Steve has held senior leadership roles across the fashion, media, education, and financial services sectors. He now devotes greater time to collecting, research, and institutional service, while continuing selective strategic advisory and board work. He serves on the Board of Trustees of The ALS Association and on the Board of Directors of Delivering Good, Inc. More information about his collecting and research may be found at www.hanonmaps.com.