Life and achievements
Glenn studied at William and Mary College and served three years with the U.S. Marines. He worked a few months as a reporter for the newspaper Kenosha Daily Tribune. In 1966 he moved to New York and played at La MaMa Experimental Theatre, since 1968 at The Actors Studio.
Glenn made his debut as a film actor in 1970 in the movie The Baby Maker. He moved to Los Angeles, and later played in a theater in Seattle.
Glenn played in the movie The Hunt for Red October (1990 ) with Sean Connery and Alec Baldwin, in the movie The Silence of the Lambs (1991 ) alongside Jodie Foster and the movie Absolute Power (1997) alongside Clint Eastwood and Gene Hackman.
Glenn is married to Carol Schwartz since 1967 and has two children.