- Donald V. Hafemann 1946-49
- A.O. Rast-vacancy
- Arthur O. Kaul 1949-51
- Theo. Delaney-vacancy
- Louis W. Wickham 1951-59
- Sam Goltermann-vacancy
- Theodore R. Griesse 1960-66
- Robert Petersen-vacancy
- Roy K. Bohrer 1967-89
- William B. Knippa (assistant) 1973-74
- William B. Knippa-vacancy
- James R. Linderman 1990-98
- Wm. Alan Sielk (associate) 1993-96
- Hubert Beck-vacancy
- Everett E. Gerdes-vacancy
- John C. Stennfeld 2000-
