Trivia

Is a regular performer at New Haven's Long Wharf Theater.

As of 2014, has appeared in four films that were nominated for the Best Picture Oscar: Esta tierra es mi tierra (1976), Regreso sin gloria (1978), Desaparecido (1982) and Los elegidos (1983).

Played the role of Miles Dentrel in two different series, Thirtysomething (1987) and Once and Again (1999).

Studied for three years at the Yale Drama School and spent an extra year there in the school's professional acting company.

Lives in Los Angeles with his wife, Perry Adleman, a writer and photographer who was a camera assistant for the film La bella y el campeón (1988), and their twins.

Is a good friend of Robert Picardo. They played together in the Viaje a las estrellas: Voyager (1995) episode "Nothing Human".

Studied at Notre Dame (1962-1965) and appeared in such University Theatre productions as "The Threepenny Opera" (as Macheath), "The Caretaker," "King Lear" (title role), "My Fair Lady" (as Henry Higgins), "Tartuffe", "Billy Budd" and "Hamlet" (as Guildenstern) while there.

Political activist known for hands-on approach to politics. Frequently participates in rallies, readings, etc., even if the cameras aren't rolling. Has turned down roles such as in Causa justa (1995) due to his political beliefs.

In 1981, he portrayed the voice of Admiral Motti in the NPR Star Wars Radio Drama, making him one of few actors who have been in both the [Star Trek] (1966) and [Star Wars] (1977) universes.

The producers of the Israeli TV series "Fauda" offered Clennon an undisclosed role in Season 2, but Clennon publicly stated that he had rejected the opportunity because of his support for Palestinians. The show later said it was sorry Clennon didn't want to join them while adding they cast the role in question the same day he said No.