Past Secretary Generals
| 2005-2008 | Karlfried Knapp |
|---|---|
| 2002-2005 | Karlfried Knapp |
| 1999-2002 | Andrew Cohen |
| 1996-1999 | Andrew Cohen |
| 1993-1996 | David Singleton |
| 1987-1993 | Marc Spoelders |
| 1984-1987 | Albert Valdman |
| 1981-1984 | Jos Nivette |
| 1978-1981 | Alan Davies |
| 1975-1978 | Gerhard Nickel |
| 1972-1975 | Gerhard Nickel |
| 1969-1972 | Bertil Malmberg |
| 1964 - ? | Peter Strevens/Max Gorosch |