Robert Ellenstein was an American actor.\nThe son of Meyer Ellenstein, a Newark dentist, Robert Ellenstein grew up in that New Jersey city and saw his father go on to become its two-term mayor. He served in the Air Corps during World War II: earning a Purple Heart during his service. He attended New York University and graduated with honors from the University of Iowa. He began acting, directing and teaching in Cleveland, Ohio. A veteran of the \"Golden Age\" of live television, for the same show played the lead in \"A Case of Identity\", later turned into the film The Wrong Man, he was the first actor to play Albert Einstein on television. Ellenstein made his first film in 1954, he was featured in Alfred Hitchcock's North by Northwest. In 1961, he played the mobster Legs Diamond in an episode of NBC's 1920s crime drama The Lawless Years with James Gregory.\nAmong his television appearances, Ellenstein guest starred in three episodes of Perry Mason. In 1957 he played defendant John Addison in \"The Case of the Vagabond Vixen.\" In 1959 he played murder victim Arthur Cartright in \"The Case of the Howling Dog,\" and in 1960 he played Medical Examiner Dr.