William Newman made his film debut in the Stuart Rosenberg film Brubaker (1980), starring Robert Redford, and followed this up with The Postman Always Rings Twice (1981) opposite Jack Nicholson and Jessica Lange.Acting roles continued through out the 1980s with roles in the Stephen King horror film Silver Bullet (1985) alongside Gary Busey and Corey Haim, the drama The Mosquito Coast (1986) with Harrison Ford and River Phoenix, and the Chevy Chase comedy Funny Farm (1988). He played a sheriff in the The Last Days of Frank and Jesse James (1986) and appeared in George A. Romero's Monkey Shines (1988) proving that, as a character actor, he has the ability to adapt to various genres.During the 1990s, work for Newman did not slow down. He appeared in: Leprechaun (1993), Mrs. Doubtfire (1993), Stephen King's The Stand (1994) opposite Rob Lowe, The Craft (1996) and Touch (1997), the latter two films with Skeet Ulrich.Newman has since worked steady in film, but is also a familiar face on TV, his roles including Eerie, Indiana (1991) episode 'Mr Chaney', Picket Fences (1992), and My Name Is Earl (2005).