William Devane, born William Joseph Devane on September 5, 1939, in Albany, New York, is a distinguished American actor who has carved a remarkable career spanning over five decades across film, television, and stage. He is best known for his commanding presence in dramatic roles, most notably as the enigmatic Greg Sumner on the long-running primetime soap opera Knots Landing and as the formidable Secretary of Defense James Heller on the Fox serial drama 24. With a career that began in the late 1960s, Devane has become a familiar face to audiences, celebrated for his ability to portray characters of authority, complexity, and quiet intensity.

Devane’s early life was marked by a move to New York City, where he studied acting at the prestigious American Academy of Dramatic Arts. After graduating, he honed his craft in off-Broadway productions and summer stock theater, eventually making his film debut in the 1970s. He gained critical attention for his role in Alfred Hitchcock’s final film, Family Plot (1976), and delivered a memorable performance as a villainous dentist in the thriller Marathon Man (1976), starring opposite Dustin Hoffman and Laurence Olivier. However, it was his lead role in the cult classic Rolling Thunder (1977) that established him as a formidable leading man, playing a tormented Vietnam War veteran seeking revenge. This performance showcased his talent for blending vulnerability with steely resolve, a trait that would define much of his later work.

The 1980s brought Devane his most iconic television role when he joined the cast of Knots Landing in 1983. As Greg Sumner, a wealthy and morally ambiguous businessman, he became a central figure in the series, appearing in over 200 episodes until the show’s conclusion in 1993. His portrayal earned him a dedicated fan base and solidified his status as a television fixture. Following this success, Devane continued to work steadily in television, appearing in shows such as The West Wing and Stargate SG-1 before landing another defining role in the 2000s. He played James Heller, the tough but principled Secretary of Defense, in the acclaimed series 24, appearing opposite Kiefer Sutherland in the show’s fourth, fifth, and sixth seasons, and later reprising the role in the limited series 24: Live Another Day in 2014. His character’s complex relationship with Jack Bauer and his daughter Audrey provided some of the series’ most compelling storylines.

In addition to his television work, Devane maintained a presence in feature films, appearing in Payback (1999) alongside Mel Gibson and in Space Cowboys (2000) as part of an ensemble cast that included Clint Eastwood, Tommy Lee Jones, and Donald Sutherland. His later career has included guest roles on popular series such as The Good Wife and Castle, as well as voice work in animated projects. Devane has also remained active in the theater, occasionally returning to the stage. With a career defined by versatility and reliability, William Devane has left an indelible mark on American entertainment, earning respect as a character actor capable of elevating any production. He continues to act selectively, maintaining a low profile while his body of work remains a testament to his enduring talent.