Dean Winters

Dean Gerard Winters (born July 20, 1964) is an American character actor. He is known for his role as Ryan O'Reily on the HBO prison drama "Oz" and had roles in TV series" Rescue Me", "30 Rock", "Sex and the City" and "". He also plays Mayhem in a series of Allstate commercials. 
Winters was born in New York City. He was raised in Long Island, New York. He studied at Brophy College Preparatory and Colorado College.