| Current (2) |
| Chairman | 2017 |
| Board of Directors | 2021 |
| Former (38) |
| Board of Directors | 2009 – 2016 |
| Board of Directors | 1919 – 1988 |
| Board of Directors | 2011 – 2012 |
| Chairman | 2004 – 2006 |
| Board of Directors | 1919 – 1990 |
| Board of Directors | 1919 – 1990 |
| Board of Directors | 2001 – 2001 |
| Board of Directors | 1919 – 1990 |
| Board of Directors | 1997 – 2000 |
| Board of Directors | 1919 – 1994 |
| Board of Directors | 1995 – 1997 |
| Chairman | 2017 – 2017 |
| Chairman | 2001 – 2004 |
| Board of Directors | 2006 – 2011 |
| Board of Directors | 1995 – 1997 |
| Board of Directors | 1995 – 2001 |
| Board of Directors | 2017 – 2021 |
| Board of Directors | 1919 – 1993 |
| Board of Directors | 1919 – 1995 |
| Chairman | 2014 – 2017 |
| Board of Directors | 1995 – 1998 |
| Board of Directors | 1919 – 1988 |
| Board of Directors | 1919 – 1990 |
| Board of Directors | 2004 – 2006 |
| Board of Directors | 1919 – 1990 |
| Board of Directors | 1919 – 1991 |
| Board of Directors | 2001 – 2006 |
| Board of Directors | 2001 – 2006 |
| Board of Directors | 1919 – 1988 |
| Board of Directors | 2012 – 2014 |
| Board of Directors | 2016 – 2017 |
| Board of Directors | 1997 – 2001 |
| Board of Directors | 1919 – 1997 |
| Board of Directors | 2001 – 2004 |
| Board of Directors | 2006 – 2014 |
| Chairman | 1998 – 2001 |
| Chairman | 1997 – 1998 |
| Board of Directors | 2011 – 2014 |