An American actor born on February 21, 1937, he is best known for his role as astronaut Dr. Frank Poole in Stanley Kubrick's iconic film "2001: A Space Odyssey" (1968). He began his career as a stuntman and quickly transitioned to acting, appearing in numerous television series and films throughout the 1960s and 1970s. He also starred in the "Star Trek" episode "Where No Man Has Gone Before." His career spans several decades, showcasing his versatility in both film and television.