The bulk of the Hans Popper Papers consists of two alphabetically organized subject files (approx. 10 feet each.) The first dates primarily from his tenure as Director of Pathology at The Mount Sinai Hospital and Dean for Academic Affairs at Mount Sinai School of Medicine. It consists primarily of records related to the administration of the Hospital and School of Medicine. The second dates from the years following his retirement in 1973 and consists primarily of research notes and an extensive correspondence file. The third major record series contains 4 linear feet of material relating to Dr. Popper’s attendance at conferences, seminars and other events, mostly but not exclusively post-1973. In addition, the collection includes smaller series containing records from Popper’s tenure at Cook County Hospital, his appointment books and pocket diaries, the records of his service on the Mount Sinai Medical Board, and oversized and audiovisual materials.