| Period | Name | Nationality |
|---|---|---|
| 1960-1965 | Frank E. Figgures | UK |
| 1965-1972 | Sir John Coulson | UK |
| 1972-1975 | Bengt Rabaeus | Sweden |
| 1976-1981 | Charles Müller | Switzerland |
| 1981-1988 | Per Kleppe | Norway |
| 1988-1994 | Georg Reisch | Austria |
| 1994-2000 | Kjartan Jόhannsson | Iceland |
| 2000-2006 | William Rossier | Switzerland |
| 2006-2012 |
Kåre Bryn |
Norway |
| 2012-2018 | Kristinn F. Árnason | Iceland |