Best known as one of the five founding members of the Broken Lizard Comedy Troupe (alongside director Jay Chandrasekhar and fellow comedians Paul Soter, Steve Lemme, and Erik Stolhanske), Kevin Heffernan came of age in West Haven, CT, attended the prestigious and exclusive Fairfield College Preparatory School in nearby Fairfield, and eventually enrolled in Colgate University, where he met Chandrasekhar and Co.; the bunch formed a collegiate comedy troupe called "Charred Goosebeak." Heffernan plays significant roles in the Lizard features, including 1996's Puddle Cruiser, 2001's Super Troopers, 2004's Club Dread, and 2006's Beerfest. He maintained a moderately high profile in Super Troopers, where he portrays the no-nonsense, by-the-book cop Farva, who makes an unsuccessful attempt to crack down the pot-smoking, prank-playing deadhead cops played by the other troupe members. Yet his prominence among his contemporaries increased quite a bit in Club Dread, in which he played a character called Lars. Heffernan edited, co-produced, and co-wrote the script for Puddle, edited and co-wrote Troopers, and co-wrote Club Dread and Beerfest. Like the other four members of the Lizard troupe, he also joined the ensemble cast of the poorly received (yet insanely lucrative) 2005 effort The Dukes of Hazzard, alongside Burt Reynolds, Seann William Scott, Johnny Knoxville, and Jessica Simpson; Heffernan plays Sheev.
In addition to his Lizardian activities, Heffernan also co-wrote the script of Divine Trash, the 1998 documentary on cinematic "gutter king" John Waters, with director Steve Yeager. Critics responded quite favorably; The New York Times' Stephen Holden referred to the piece as "a fine and fascinating biography."