Mark Valley is an American actor. His Hollywood career started in the 1990s. His first starring role on television was as Jack Deveraux in the soap opera Days of Our Lives. He next had recurring roles in Once and Again and ER. He later played the titular character in the 2000 film Jericho. He next starred in short-lived shows Pasadena and Keen Eddie. He gained further recognition for his role as Brad Chase in Boston Legal. He went on to star as John Scott in Fringe, Christopher Chance in Human Target, and as Oliver Richard in Harry’s Law. He also appeared as Daniel Shaw in CSI: Crime Scene Investigation.