Director Marshall W. Mason (front) with (back, left to right) actors Neil Flanagan, Nancy Snyder, Judd Hirsch, and Daniel Seltzer in a publicity shot for Circle Repertory Company’s production of Jules Feiffer’s “Knock Knock” in 1976; set design by John Lee Beatty, costume design by Jennifer von Mayrhauser, lighting design by Dennis Parichy, sound design by Charles London and George Hansen. (Photo courtesy of the New York Public Library)