2021 –
Gayle Porias
15
2017 – 2021
Taylor C. Mertins
14
2013 – 2017
Clyde T. Nelson
13
2003 – 2013
Russell T. Urban
12
1999 – 2003
T. Todd Smith
11
1990 – 1999
R. Carl Ennis
10
1987 – 1990
William Taylor
9
1983 – 1987
John Chadsey
8
1980 – 1983
Charles Bartholomew
7
1976 – 1980
Richard McNutt
6
1975 – 1980
James Unruh
5
1969 – 1975
William Moon, Jr.
4
1967 – 1969
Fred B. Wyand
3
1962 – 1967
Hasbrouck Hughes
2
1959 – 1962
Herbert Moyer
1