(written from a Production point of view)
He appeared in The Patriot, starring Mel Gibson and featuring DS9's Rene Auberjonois. Other motion pictures he has appeared in include Firestarter (1984, with Louise Fletcher and Robert Miano), The Color Purple (1985, with Whoopi Goldberg), Maximum Overdrive (1986, with John Short), The Bedroom Window (1987, with Wallace Shawn, Brad Greenquist and Mark Margolis), Traxx (1988, with Herschel Sparber and Robert Miano), Moon 44 (1990, with Malcolm McDowell and Brian Thompson), Young Guns II (1990, with Christian Slater and Tracey Walter), Kuffs (1992, with Christian Slater, George De La Peña, and Ashley Judd), Universal Soldier (1992, with Lilyan Chauvin and Tommy "Tiny" Lister, Jr.), Stargate (1994, with Erik Holland, Erick Avari, and Frank Welker), Midnight in the Garden of Good & Evil(1997) alongside Bob Gunton, Anne Haney, Richard Herd and J. Patrick McCormack.
He recently starred in the acclaimed HBO TV series Deadwood, alongside Jim Beaver, Brad Dourif, and Alice Krige. He also recently played Earl in the TNT series Saving Grace, which also stared Roger Aaron Brown, Steve Rankin, and Mark L. Taylor.
He also starred as the mysterious Dr. Beauregard, who apparently either time-traveled from 1963 to 2012 or was in some sort of suspended animation during that time, on the J. J. Abrams created series Alcatraz.