Perhaps most well known for his Emmy-winning portrayal of John Monroe in the comedy series My World and Welcome to It, Windom is also remembered for his recurring role as Dr. Seth Hazlitt on CBS's Murder, She Wrote. He also made a memorable appearance in the 1967 Star Trek episode "The Doomsday Machine."
After completing his World War II-era service in the United States Army, he made his screen acting debut in a 1949 episode of The Philco-Goodyear Television Playhouse and went on to appear in his first film, To Kill a Mockingbird (as the prosecutor character Mr. Gilmer), in 1962.
His Broadway credits include the 1956 revival of Fallen Angels and the 1960 original production of Viva Madison Avenue!
Born in New York City, he was the son of Isobel Peckham and architect Paul Windom and the great-grandson of U.S. Republican Party politician and Secretary of the Treasury
Actress Inger Stevens played Windom's character's (Glen Morley's) daughter on the ABC situation comedy The Farmer's Daughter.