1974-1978 - Harold Orbach, Kansas State University, U.S.A.

1978-1982 - Anne Marie Guillemard, University of Paris V (Sorbonne), France

1982-1986 - Betty Havens, University of Manitoba, Winnipeg, Canada

1986-1990 - Anne Marie Guillemard, University of Paris V (Sorbonne), France

1990-1994 - Neena Chappell, University of Victoria, Canada

1994-1998 - Alan Walker, University of Sheffield, UK

1998-2002 - Alan Walker, University of Sheffield, UK

2002-2006 - Lars Andersson, Linköping University, Sweden