| Current (2) |
| Board of Directors | 2025 |
| Chairman | 2020 |
| Former (24) |
| Chairman | 1934 – 1997 |
| Chairman | 2012 – 2013 |
| Board of Directors | 1995 – 1999 |
| Chairman | 2013 – 2015 |
| Board of Directors | 1934 – 1990 |
| Board of Directors | 1995 – 1997 |
| Board of Directors | 1999 – 2005 |
| Chairman | 2003 – 2009 |
| Board of Directors | 2018 – 2019 |
| Chairman | 1997 – 2000 |
| Board of Directors | 2014 – 2016 |
| Chairman | 2009 – 2012 |
| Chairman | 1934 – 1992 |
| Chairman | 2019 – 2020 |
| Board of Directors | 1934 – 1995 |
| Board of Directors | 2002 – 2005 |
| Board of Directors | 2005 – 2018 |
| Board of Directors | 1934 – 2016 |
| Board of Directors | 2016 – 2019 |
| Chairman | 2015 – 2018 |
| Chairman | 2000 – 2003 |
| Chairman | 2018 – 2019 |
| Board of Directors | 1934 – 1995 |
| Board of Directors | 2023 – 2025 |