What Alfred Hitchcock film did that actor who played John Koenig appear in?
John Koenig: John Koenig is a fictional character from the television series "". John Koenig:  He was played by Martin Landau. Martin Landau: Martin James Landau ( ; June 20, 1928 – July 15, 2017) was an American actor of stage, television and film, acting coach, executive producer, voice artist, editorial cartoonist and comic strip producer. Martin Landau:  His career began in the 1950s, with early film appearances including a supporting role in Alfred Hitchcock's "North by Northwest" (1959).
North by Northwest