Victor Joseph Garber (born March 16, 1949) is a Canadian-American actor and singer. He is known for playing: Jesus in Godspell; Anthony Hope in Sweeney Todd: The Demon Barber of Fleet Street; 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 Ken Taylor, Canadian Ambassador to Iran, in Argo. He was a series regular on Legends of Tomorrow as Dr. Martin Stein, having previously played the same role in a recurring capacity on The Flash and on the web series Vixen.