Jack Mulcahy is an American actor known for being one of the leads in The Brothers McMullen. Mulcahy started in the entertainment business as a lead vocalist and guitarist for various Rock 'n' roll bands around New York City. His first film role was in Porky's (1981), directed by Bob Clark. After the sequel, Porky's II: The Next Day (1983), Jack appeared in several films and television shows including Law & Order; NYPD Blue; Creating Rem Lezar; Awakenings; and Cadillac Man. In 1995, he was cast as Jack, one of the three brothers in The Brothers McMullen. The film won the Grand Jury Prize at the Sundance Film Festival that year and was distributed by 20th Century Fox.