(written from a Production point of view)
Hailing from the reknown Actors Studio, he is probably best known to movie audiences for his appearances in George Roy Hill's Butch Cassidy and the Sundance Kid and The Sting. The first featured Jeff Corey, Ted Cassidy, Kenneth Mars and Don Keefer, while the latter had Ray Walston and James Sloyan in the cast. Among his other television guest appearances was a 1966 episode of The Man From U.N.C.L.E. ("The Off-Broadway Affair"). Dierkop also appeared in an unsold 1965 television pilot titled The Long Hunt of April Savage, starring Robert Lansing and produced by Gene Roddenberry.
- Silent Night, Deadly Night (1984, with Lilyan Chauvin)
- Merchants of Venus (aka A Dirty Little Business; 1998, with Robert Easton, Michael Pollard and Helen Cates)