| Current (2) |
| Board of Directors | 2023 |
| Chairman | 2026 |
| Former (16) |
| Board of Directors | 1998 – 2000 |
| Board of Directors | 1946 – 1998 |
| Board of Directors | 1946 – 1998 |
| Chairman | 2004 – 2005 |
| Board of Directors | 2004 – 2007 |
| Board of Directors | 1998 – 2000 |
| Chairman | 2016 – 2023 |
| Chairman | 2005 – 2010 |
| Board of Directors | 1946 – 1988 |
| Chairman | 2002 – 2004 |
| Board of Directors | 1946 – 1988 |
| Chairman | 2011 – 2014 |
| Board of Directors | 2010 – 2014 |
| Board of Directors | 1946 – 1989 |
| Chairman | 1998 – 2002 |
| Chairman | 2023 – 2026 |