Stephen Harold Tobolowsky is an American character actor. He is known for film roles such as insurance agent Ned Ryerson in Groundhog Day and amnesiac Sammy Jankis in Memento, as well as such television characters as Commissioner Hugo Jarry in Deadwood, Bob Bishop in Heroes, Sandy Ryerson in Glee, Stu Beggs in Californication and White Famous, "Action" Jack Barker in Silicon Valley, Dr. Leslie Berkowitz in One Day at a Time, Principal Earl Ball in The Goldbergs, and Dr. Schulman in The Mindy Project.

Tobolowsky was born on May 30, 1951, in Dallas, Texas. He studied geology at Southern Methodist University but switched to theater after being cast in a production of "The Crucible." He later attended the University of Illinois at Urbana-Champaign, where he graduated with a degree in drama.