(written from a Production point of view)
Prior to his Trek appearance, Mitchell appeared in the 1988 drama The Chocolate War (with John Glover and Wallace Langham), the crime drama Ghosts...of the Civil War (1988), the television sport drama Rose Against the Odds (1991), and the drama Combination Platter (1993).
Mitchell's further credits include the drama Life (1996), the crime drama L.A. Confidential (1997, with James Cromwell, Steve Rankin, Matt McCoy, Symba Smith, Bob Clendenin, John Mahon, Brenda Bakke, Steven Lambert, Jim Metzler, Don Pulford and Allan Graf), the short drama Interrogation (2004), the comedy Hard Four (2007, with Charles Dennis, Ian Abercrombie, Hamilton Camp, Ed Begley, Jr., Michele Scarabelli, Willie Garson, Carolyn Seymour, and Beverly Washburn), and the drama Rabbit Hole (2010). On the latter two films he worked with his then wife actress Salli Saffioti.
In 2005, Mitchell wrote the screenplay for the drama Welcome to September. In 2009 he worked as writer, director and producer on the short films Memphis Calling and Labor Intensive.