Son of Elizabeth and Theodore Glenn.

Portrayed an ex-CIA agent in Man on Fire (1987). Denzel Washington portrayed an ex-CIA agent on the remake of Man on Fire (2004). Both actors played corrupt cops on Training Day (2001).

Father, with Carol, of two girls named Dakota Ann Glenn, a writer, and Rio Elizabeth Glenn, an actress.

Appears in Puerto Vallarta Squeeze (2004) opposite Harvey Keitel, with whom he shares the role of Jack Crawford in the Hannibal Lecter series.

Brother of Bonnie Glenn and Terry Glenn.

Received a BA in English at William & Mary College.

Did 2,000 push-ups (at one time) on the set of Urban Cowboy (1980).

His The Silence of the Lambs (1991) character, Jack Crawford, was written out of the adaptation of the sequel, Hannibal (2001). Nevertheless, he was able to work with Clarice Starling later that year by appearing in The Shipping News (2001) with Julianne Moore.

Shares the role of astronaut Alan Shepard with his The Silence of the Lambs (1991) cast mate Ted Levine.

Despite being left-handed, he was so dedicated to playing right-handed astronaut Alan Shepard in The Right Stuff (1983), that he used his right hand for writing and other important actions on-screen.

Served in the United States Marine Corps in the early 1960s.

Is one of three actors to play Jack Crawford in the Hannibal Lecter films. He played the role in The Silence of the Lambs (1991), while Dennis Farina played the role in Manhunter (1986), and Harvey Keitel played the role in Red Dragon (2002).

Was a close friend of Toshirô Mifune.

Has a small part in Apocalypse Now (1979). The lead role was originally given to Harvey Keitel, who went on to succeed Glenn in the role of Jack Crawford in the The Silence of the Lambs (1991) prequel, Red Dragon (2002).

Rode along with the Chicago Fire Dept.`s Squad 5 in preperation for his role in Backdraft (1991).