Alan Douglas Ruck (born July 1, 1956) is an American actor. He played Cameron Frye, Ferris Bueller's hypochondriac best friend in John Hughes' Ferris Bueller's Day Off (1986), and Stuart Bondek, the lecherous, power-hungry member of the mayor's staff in the ABC sitcom Spin City. His other notable films include Bad Boys (1983), Three Fugitives (1989), Young Guns II (1990), Speed (1994), Twister (1996), and Kickin' It Old Skool (2007).