Denis Colin Leary (born August 18, 1957) is a comedian and actor and musician born in Worcester, Massachusetts to Irish Catholic immigrants. His routines involve a deeply cutting, rambling, profane motor mouth and profane style, and is not afraid to go after whatever he damn well feels like.
He’s incredibly proud of his Irish heritage, and does not apologize for his love of the Boston Red Sox, the Bruins, or Boston in general (he even forgave Bill Buckner, even though it seemed no one else will).
He’s related, through various marriages, to Conan O'Brien. He’s also an old friend of Jon Stewart, and was a guest on The Daily Show fairly regularly during Stewart’s run.