| Number | Begin | End | Name |
| 42 | January 2024 | | Isaac R. Griebe |
| 41 | December 2022 | January 2024 | Sabastien J. Upham |
| 40 | January 2022 | December 2022 | Max J. Aranyos |
| 39 | January 2021 | January 2022 | Nick Castro |
| 38 | January 2020 | January 2021 | Luke E. Louden |
| 37 | September 2018 | January 2020 | Danny G. Mook |
| 36 | January 2018 | August 2018 | Chipper L. Crosswell, III |
| 35 | January 2017 | January 2018 | Todd R. Henry, Jr. |
| 34 | January 2016 | January 2017 | Zach J. Zajdel |
| 33 | January 2015 | January 2016 | Tanner S. Sova |
| 31 | January 2014 | January 2015 | Drew P. Thomas |
| 32 | January 2014 | | Drew P. Thomas |
| 30 | January 2013 | January 2014 | Stanton J. McAtee |
| 29 | February 2012 | January 2013 | Adam Thomas |
| 28 | January 2011 | February 2012 | Clark Gingras |
| 27 | February 2010 | January 2011 | Bradly G. Martin |
| 26 | September 2008 | February 2010 | Robert Cross |
| 25 | March 2008 | September 2008 | Paul Krajanke |
| 24 | May 2007 | March 2008 | Russell Kleinhans, Jr. |
| 23 | January 2007 | May 2007 | Jason Brayton |
| 22 | March 2006 | January 2007 | Christopher M. Hodge |
| 21 | January 2005 | March 2006 | Matthew N. Connell |
| 20 | April 2004 | January 2005 | Edgar Carrasco |
| 19 | February 2003 | April 2004 | Scott D. Lucius |
| 18 | February 2002 | February 2003 | Andrew R Magnus |
| 17 | June 2001 | February 2002 | Christopher A. Sliva |
| 16 | April 2000 | June 2001 | Ryan S. Neil |
| 15 | May 1999 | April 2000 | Tim P. Bouchard |
| 14 | May 1998 | May 1999 | John Yang |
| 13 | August 1997 | May 1998 | Matthew P. Ostrander |
| 12 | February 1995 | March 1997 | Jeff F. Proctor |
| 11 | February 1994 | March 1996 | Paul S. Hrnchar |
| 10 | February 1993 | March 1994 | John M. Arends |
| 9 | February 1992 | March 1996 | Brady D. Ferron |
| 8 | February 1991 | March 1992 | Jeff D. Shook |
| 7 | February 1990 | March 1991 | John M. Mullaney |
| 6 | February 1989 | March 1990 | Scott Keery |
| 5 | June 1988 | May 1989 | Thomas R. Elliott |
| 4 | February 1988 | March 1989 | Mike Standerwick |
| 3 | June 1987 | May 1988 | Jim G. Stewart |
| 2 | June 1986 | May 1987 | Ed D. Mackle |
| 1 | | | Jim W. Snyder Jr., PhD |