Victor Joseph Garber (born March 16, 1949) is a Canadian film, stage and television actor and singer. He is known for playing Jesus in Godspell, John Wilkes Booth in Assassins, Jack Bristow in the television series Alias, Max in Lend Me a Tenor, Thomas Andrews in James Cameron's Titanic and as Canadian ambassador to Iran, Ken Taylor in Argo. He currently guest stars as Dr. Martin Stein on The Flash and will appear as a regular on Legends of Tomorrow.