1950s
March 21 – June 20 1966
June 20 1992
Luthringer, Ruth
May 24 1993
Milan, Jose
June 28 1994
Smalley, Eugene B.
October 26 1994
December 15 1994
1995
September 21 1995
Weick, George T.
March 22 1996
Mittempergher, Lorenzo
May 3 1996
Ware, George
April 24 1999