Marc Vann is the type of prolific TV actor who's worked steadily for decades, yet has almost no name recognition. Starting out as a stage actor, Vann began his screen acting career with bit roles on shows such as "Malcolm in the Middle" (Fox, 2000-06), "Judging Amy" (CBS, 1999-2005), and "JAG" (NBC/CBS, 1995-2005), before landing a recurring part as Conrad Ecklie on CBS's "CSI: Crime Scene Investigation" (2000-15). More roles followed, including a memorable multi-episode stint as a mysterious doctor on "Lost" (ABC, 2004-2010), ensuring that astute TV viewers would remember his face, if not his name.