Theodore Tillman Shackelford III (born June 23, 1946) is an American actor. He played Gary Ewing in the CBS television series Dallas and Knots Landing (1979–1993); since 2006, he has appeared in a recurring role on the CBS soap The Young and the Restless, portraying twin brothers William and Jeffrey Bardwell. Life and career Shackelford was born in Oklahoma City, Oklahoma, and went to college at the University of Denver. He appeared in the role as Ray Gordon on the daytime soap opera Another World from 1975 to 1977. He has also appeared in roles on Wonder Woman and later in The Division. He also starred in the British science fiction series Space Precinct. Shackelford is best known for his role as Gary Ewing on the CBS television series Knots Landing, in which he starred from 1979 to 1993. He also appeared as Gary Ewing on several episodes of CBS's Dallas. The role was originally played by actor David Ackroyd, who was unable to return for future appearances after his 1978 turn as the character. On February 2, 2006, Shackelford joined the cast of the daytime soap opera The Young and the Restless as Genoa City district attorney William Bardwell. His last air date on the popular soap as William Bardwell was on July 18, 2007, when his character succumbed to complications caused by a stroke. However, on August 7, 2007, Shackelford returned to the show as Bardwell's identical twin brother, Jeffrey Bardwell. In 2013, Shackelford reprised the role of Gary Ewing in three episodes of the new Dallas series on TNT, in one of which he was reunited with Joan Van Ark as Valene. Filmography Another World as Raymond 'Ray' Gordon #1 (1975-1977) Wonder Woman as Adam and Pete (2 episodes, 1977-1978) The Defection of Simas Kudirka (1978) as Blain The Jordan Chance (1978) as Brian Klosky Ebony, Ivory & Jade (1979) as Barnes The Rockford Files as Eric Genther (1 episode, 1979) Soap as R.C. (1 episode, 1980) Terror Among Us (1981) as Delbert Ramsey Summer Fantasy (1984) as Carlisle Alfred Hitchcock Presents as Garret (1 episode, 1987) Hotel as Tom Webb/Richard Anderson (2 episodes, 1984-1987) Sweet Revenge (1987) as Boone The Twilight Zone as Fr. Mark Cassidy (1 episode, 1988) The Young Riders as Lucas Malone (1 episode, 1989) Guns of Paradise as Preston McMillian (1 episode, 1989) Dallas as Gary Ewing (9 episodes, 1979-1991) Baby of