The collection, 1930-2013, is primarily comprised of records and materials related to Callahan's work in theatre as an actor, producer, and teacher. It includes production materials for plays, including scripts, programs, publicity, cast lists, and photographs. The collection also contains personal records and materials belonging to both of his parents, yearbooks, photographs, ephemera, and audio recordings from Callahan's rap group Age of Consent.

The collection, 1930-2013, is primarily comprised of records and materials related to Callahan's work in theatre as an actor, producer, and teacher. It includes production materials for plays, including scripts, programs, publicity, cast lists, and photographs. The collection also contains personal records and materials belonging to both of his parents, yearbooks, photographs, ephemera, and audio recordings from Callahan's rap group Age of Consent.