- Sean Grennan is known for The Untouchables (1987), Rudy (1993) and Law & Order: Special Victims Unit (1999). He is married to Kathy Santen.
- SpouseKathy Santen(? - present)
- Cheri Coons, Nichael Duff, Kathy Santen and he were nominated for a 1994 Joseph Jefferson Award for New Work for "The Phantom of the Country Palace", at the Marriott Theatre in Chicago, Illinois.
- Co-wrote "Phantom of the Country Opera", "Ms. Cinderella", "The Ho-Ho-Ho Show", and "Luck" with Kathy Santen (his wife), Cheri Coons and Michael Dunn.
- Has a dog named Jack the Dog.
- Has been seen extensively on the Chicago stage.
- Currently starring with his wife in a world premiere musical at Florida Stage in Manalapan, FL.
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