John Sondheim is a retired librarian who was at the Enoch Pratt Free Library for 27 years. His work at the ACLU is concerned with legislative matters and limited policy development. Prior to being a librarian, Sondheim worked as a systems analyst. He has been a board member since 1990, and he additionally served on ACLU boards in both Western Missouri and Kansas. He has been active in other organizations, such as Planned Parenthood, and was a Democratic Ward Committeeman in Western Missouri. Sondheim lives in Baltimore City.