Timothy S. Guinee (born November 18, 1962) is an American stage, television, and feature-film actor. Primarily known for his roles as Tomin in the television series Stargate SG-1 (1997–2007) and railroad entrepreneur Collis Huntington AMC's Hell on Wheels (2011–2016), he appeared in the Marvel Cinematic Universe (MCU) feature films Iron Man (2008) and Iron Man 2 (2010) as United States Air Force Major Allen, and as struggling father and retired major Clay Wilson in the first season of the streaming television series The Punisher (2017–2019).
Guinee met his wife Daisy Foote, during the production of Hallmark Hall of Fame: Lily Dale (1996). Foote is the daughter of 1962 Academy Award–winning screenwriter and Pulitzer Prize–winner Horton Foote, who adapted Lily Dale for the film himself.
Guinee, who has two brothers and two sisters, was born in Los Angeles, California and raised in Illinois and Texas. He attended Kinder High School for the Performing and Visual Arts in Houston, Texas before he founded a theater group in Texas. Later, he moved to New York in order to attend the American Academy of Dramatic Arts. He later attended the University of North Carolina School of the Arts in Winston-Salem, where he graduated and had his film debut.