| Current (2) |
| Board of Directors | 2013 |
| Chairman | 2026 |
| Former (20) |
| Board of Directors | 1946 – 1993 |
| Chairman | 2013 – 2026 |
| Board of Directors | 1996 – 2000 |
| Board of Directors | 1946 – 1996 |
| Board of Directors | 2004 – 2009 |
| Board of Directors | 1946 – 1994 |
| Board of Directors | 1946 – 1988 |
| Board of Directors | 1996 – 2000 |
| Board of Directors | 2000 – 2001 |
| Board of Directors | 2008 – 2009 |
| Board of Directors | 1946 – 1990 |
| Board of Directors | 1946 – 1996 |
| Board of Directors | 1946 – 1993 |
| Board of Directors | 1946 – 1992 |
| Board of Directors | 2001 – 2004 |
| Board of Directors | 1946 – 1991 |
| Board of Directors | 1946 – 1988 |
| Board of Directors | 2000 – 2008 |
| Board of Directors | 1946 – 1996 |
| Board of Directors | 1946 – 2013 |