Clennon was born in Waukegan, Illinois, the son of Virginia, a homemaker, and Cecil Clennon, an accountant. Clennon is well known for his political activism.

In 1980, David Clennon provided the voice for Admiral Motti in NPR's Star Wars The Original Radio Drama, the role previously played on the big screen by Richard LaParamentier.

• Being There 1979 film
• John Carpenter's The Thing1982 film
• Missing 1982 film
• The Right Stuff1983 film
• Sweet Dreams 1985 film
• thirtysomething1987-1991 television series
• The Couch Trip 1988 film
• Matinee 1990 film
• Light Sleeper1992 film
• Tecumseh 1994 film
• From the Earth to the Moon 1998 HBO miniseries
• Silver City2004 film
• Constellation 2007 film

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