Sean Grennan


Sean Grennan is thrilled to be making his Peninsula Players acting debut this summer!  A Chicago native, Sean appeared there in principal work at many theatres including The Goodman, The Court, Drury Lane, The Marriott, Chicago Shakespeare Theatre, Victory Gardens, Apple Tree, and many more.  His regional work includes numerous engagements in Kansas City at the American Heartland Theatre and Florida at Florida Stage as well as Off-Broadway in Perfect Crime.  His film and TV principal roles include: The Untouchables, Rudy, Early Edition, Unsolved Mysteries, The Human Factor, Law & Order-Special Victims Unit, Staring Back (Ensemble Emmy Award) and Law & Order-Criminal Intent.  Sean now lives in NYC with excellent dog Hank and his wife, actress Kathy Santen who is currently appearing in Broadway’s “Wicked”. More at: (

 2014 Roles: Playwright – The Tin Woman; Dr. Armstrong in And Then There Were None, Jane, etc. in The Mystery of Irma Vep