| Current (2) |
| Chairman | 2025 |
| Board of Directors | 2023 |
| Former (16) |
| Chairman | 2024 – 2025 |
| Board of Directors | 2000 – 2007 |
| Board of Directors | 1938 – 1995 |
| Board of Directors | 1938 – 1997 |
| Chairman | 2011 – 2012 |
| Board of Directors | 2017 – 2020 |
| Chairman | 2012 – 2016 |
| Chairman | 2023 – 2024 |
| Chairman | 2007 – 2011 |
| Chairman | 2003 – 2007 |
| Board of Directors | 1938 – 1995 |
| Board of Directors | 2007 – 2011 |
| Board of Directors | 2003 – 2010 |
| Chairman | 2016 – 2017 |
| Chairman | 2017 – 2023 |
| Chairman | 1938 – 2003 |