The Canadian-born actor made his Broadway debut in 1955 in “The Diary of Anne Frank,” playing one of the occupants of the Amsterdam attic where the Franks were hiding. He played the same role in the 1959 film version.
He was in nine other Broadway plays, including Paddy Chayefsky’s “Tenth Man” in 1959 and Neil Simon’s “Come Blow Your Horn” in 1961.
Jacobi was in some two dozen other movies, including the Dudley Moore comedy “Arthur,” Woody Allen’s “Everything You Always Wanted to Know About Sex” and Barry Levinson’s “Avalon.”
His last movie was “I.Q.” in 1994. He played the logician Kurt Godel, one of Albert Einstein’s professor friends at Princeton.
He also appeared in many TV shows, including “The Man From U.N.C.L.E.” and “That Girl.” He was a regular on “The Dean Martin Show” on NBC for two seasons in the early 1970s.
Jacobi was born Louis Harold Jacobovitch in Toronto and began acting as a boy.