John Henry Diehl (born May 1, 1950) is an American film, television, and stage 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, Nixon, Jurassic Park III and the TV series Miami Vice and The Shield. 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.

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