Westberg was born and raised in Seattle, graduated in Radio/TV Speech from Washington State University, served a stint as a naval officer on board a destroyer primarily in the Western Pacific and arrived in Hollywood in 1966 to seek his fame and fortune. His progress moved along nicely, and by the early 70's, was earning a living as an actor, and continued to do so for the next ten years. In 1982, he moved behind the camera, and was hired as an admin. assistant at Actors Equity. There he oversaw the agency dept. and the 99-seat Waiver Program. In 1983, he joined the staff at ICM as the West Coast Head of Theatre at the agency. In 1986, he headed at Triad Artists Inc. where he covered theatre and independent features. Then, in 1991, he established David Westberg Management which he headed for the next fifteen years. Finally, inn 2006, he returned to acting, having come full circle. Westberg volunteers time and energy to entertainment-related organizations. He served four years as Chairman of the Western Council of the Actors Fund of America, sits as Co-Chairman of the Board of Directors of the SAG.AFTRA Federal Credit Union, and for the past four years, has been on the SAG.AFTRA Board of Directors of the Los Angeles local.