Secretaries General
| Period | Name | City, Country |
| from 2016 | K.D. Boffard | Johannesburg, South Africa |
| 2015 (interim) | F. Harder | Basel, Switzerland |
| 2009-2015 | J.-C. Givel | Lausanne, Switzerland |
| 2001-2009 | F. Harder | Basel, Switzerland |
| 1999-2001 | J.R. Siewert | Munich, Germany |
| 1993-1999 | Th.P. Rüedi | Chur, Switzerland |
| 1981-1993 | M. Allgöwer | Basel, Switzerland |
| 1965-1981 | J. van Geertruyden | Brussels, Belgium |
| 1957-1965 | P. Martin | Brussels, Belgium |
| 1938-1957 | L. Dejardin | Brussels, Belgium |
| 1912-1938 | L. Mayer | Brussels, Belgium |
| 1902-1912 | A. Depage | Brussels, Belgium |
