Denis Colin Leary (born August 18, 1957) is an American actor, comedian, writer, director and film producer. Leary is known for his biting, fast paced comedic style and chain smoking. He is the star and co-creator of the television show Rescue Me, which ended its seventh and final season on September 7, 2011. Leary has starred in many motion pictures, most recently as Captain George Stacy in Marc Webb's 2012 film The Amazing Spider-Man and the voice of Diego in the animated Ice Age series.
Leary was born in Worcester, Massachusetts, the son of Irish Catholic immigrants. His mother, Nora (née Sullivan), was a maid, and his father, John Leary, was an auto mechanic. As both of his parents are from Killarney, County Kerry, Ireland, Leary holds both Irish and U.S. citizenship. Through marriage, Leary is a third cousin of talk show host Conan O'Brien. He attended Saint Peter-Marian High School, in Worcester.