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London was born in San Diego, California to Frank London, a construction worker, and Debborah Osborn, a waitress. He has an identical twin brother, Jeremy London, who is also an actor. As of 2005, the two have acted together in an episode of 7th Heaven entitled "Smoking". Jeremy was Jason's stunt double in The Man in the Moon.
He has enjoyed moderate success starring mostly as a rebellious, edgy young addict in feature films such as Broken Vessels and $pent. He also starred as Jason in the 2000 NBC miniseries Jason and the Argonauts. Jason also starred in Poor White Trash playing sleazy ladies-man Brian Ross. Poor White Trash was written by Michael Addis and Tony Urban and plays frequently on Comedy Central.