Matthew Fox is an American actor best known for his role as Jack Shephard on the popular television series Lost, which aired from 2004 to 2010. His performance earned him critical acclaim and several award nominations, establishing him as a prominent figure in the entertainment industry. In addition to Lost, Fox has appeared in various films and television shows, including Party of Five and Speed Racer. He has also ventured into theater and has been involved in various charitable activities throughout his career. Fox's work has made a significant impact on both television and film.