John Henry Diehl (born May 1, 1950) is an American character actor. Noted for his work in avant-garde theater, Diehl has performed in more than 140 films and television shows, including Land of Plenty, Stripes, City Limits, Nixon, Jurassic Park III and the TV series Miami Vice, The Shield, and Point Pleasant.
Diehl has "largely avoided the typecasting that is an accepted part of most character actors' careers." He has been a member of The Actors Studio since 2004.
Diehl was born in Cincinnati, Ohio in 1950. His father, John A. Diehl, was a civil engineer, and his mother, Mary, was a social worker. Raised in a devoutly Roman Catholic family, he was educated at parochial schools, and graduated from St. Xavier High School in 1968.

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