John Dinkel  07/28/55 to 12/31/59
Ralph Mitchell  01/01/60 to 07/03/62
Ronald G. Cribbet  07/04/62 to 12/31/87
Theodore W. Shannon, Jr.  01/01/88 to 12/31/95
Dirk L. Hammersmith  01/01/96 to 12/31/99
Theodore W. Shannon, Jr.  01/01/00 to 12/31/11
Carson L. Shelton 1/1/2012 to 12/31/2023