This website highlights a collection of rare books donated to the Patricia D. Klingenstein Library of the New-York Historical Society by Sidney Lapidus in 2010.


Sidney Lapidus is a Retired Managing Director and Senior Advisor of Warburg Pincus LLC, one of the country’s leading private equity firms. He is a graduate of Princeton University, where he majored in American History, and Columbia University Law School. He is active in numerous charitable and philanthropic organizations, several of which concern American history and book collecting. He is Vice Chairman of the American Antiquarian Society, founded in 1812 in Worcester, Massachusetts, and serves on the Board of Trustees of the New-York Historical Society, chairing its Library Committee. He has served for many years on the Advisory Council of the Princeton University History Department, and in 2003, he and his wife established the Sidney and Ruth Lapidus Professorship in the American Revolutionary Era at Princeton. He is President of the American Jewish Historical Society, the nation’s oldest ethnic archival organization founded in 1892. He is an avid antiquarian book collector, with the focus on American and British books and pamphlets, principally concerning the politics and economics of the Revolutionary Era, 1750-1800.