Aidan Quinn (born March 8, 1959) is an American actor. He made his film debut in Reckless (1984) and has starred in over 80 feature films, including Desperately Seeking Susan (1985), The Mission (1986), Stakeout (1987), All My Sons (1987), Avalon (1990), Benny & Joon (1993), Legends of the Fall (1994), Mary Shelley's Frankenstein (1994), Michael Collins (1996), Practical Magic (1998), Song for a Raggy Boy (2003), Wild Child (2008) and Unknown (2011). He also played Captain Thomas "Tommy" Gregson on the CBS television series Elementary (2012–19).