- Born
- Birth nameJack Eugene Stewart
- Jack Grinnage was born on January 20, 1931 in Los Angeles, California, USA. He is an actor, known for Rebel Without a Cause (1955), Kolchak: The Night Stalker (1974) and Wolf Larsen (1958).
- As of October 2016, he is the only surviving cast member of Kolchak, the Night Stalker.
- Turned down a part in Forbidden Planet to work on Rebel Without a Cause.
- In real life, he became a close friend of Darren McGavin and his third wife, Kathie Browne.
- Best known as the nerdy, effete News Service Reporter Ron Updyke in Kolchak, the Night Stalker.
- Attended Los Angeles City College.
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