July 1981
September 21 – December 20 1987
Clark, Ross C.
March 21 – June 20 1989
Clark, Ross C.
September 21 – December 20 1990
Clark, Ross C.
June 21 – September 20 1991
Clark, Ross C., Bachtell, Kris
August 1988
Clark, Ross C.
August 1988
Clark, Ross C.
August 1988
Clark, Ross C.