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Denis Colin Leary (born August 18, 1957) is an American actor and comedian. Born in Massachusetts, Leary first came to prominence as a stand-up comedian, especially through appearances on MTV (including the comedic song "Asshole") and through the stand-up specials No Cure for Cancer (1993) and Lock 'n Load (1997). Leary began taking roles in film and television starting in the 1990s, including substantial roles in the films Judgment Night (1993), Gunmen (1994), Operation Dumbo Drop (1995) and Wag the Dog (1997).

In the 2000s, he developed and starred in the television show The Job (2001–2002) and was the star and co-creator of Rescue Me (2004–2011), for which he received two Primetime Emmy nominations, one for writing and one for acting. He has continued to take starring roles in films, including Captain George Stacy in The Amazing Spider-Man and Cleveland Browns head coach Vince Penn in Draft Day. Leary has also done voice work, including Francis the ladybug in A Bug's Life and Diego the saber tooth tiger in the Ice Age franchise.

He and his wife Ann Leary are the inspiration behind the episode of the Amazon series Modern Love "Rallying to Keep the Game Alive". From 2015 to 2016, Leary wrote and starred in the comedy series Sex & Drugs & Rock & Roll on FX.

Early life
Denis Colin Leary was born on August 18, 1957, in Worcester, Massachusetts, the son of Catholic immigrant parents from County Kerry, Ireland. His mother, Nora (née Sullivan) (b. 1929), was a maid, and his father, John Leary (1924–1985), was an auto mechanic. Leary is a citizen of both the United States and Ireland. Leary is a third cousin of talk show host Conan O'Brien.

Leary attended Saint Peter's High School (now Saint Paul's) in Worcester and graduated from Emerson College in Boston. At Emerson, he met fellow comic Mario Cantone, whom Leary considers to be his closest friend. While a student, Leary founded the Emerson Comedy Workshop, a troupe that continues on the campus today.

After graduating from Emerson in 1981, Leary taught comedy-writing classes at the school for five years. In May 2005 he received an honorary doctorate and spoke at his alma mater's undergraduate commencement ceremony; and is credited as Dr. Denis Leary on the cover of his 2009 book Why We Suck.