E. Ballard Baker, January 1, 1985-March 24, 1985
Lawrence L. Koontz, Jr., April 1, 1985-April 30, 1993
Norman K. Moon, May 1, 1993-November 25, 1997
Johanna L. Fitzpatrick, November 26, 1997-March 31, 2006
Walter S. Felton, Jr., April 1, 2006-December 31, 2014
Glen A. Huff, January 1, 2015-December 31, 2018
Marla G. Decker, January 1, 2019- present