1994 (Andrew Ford) No address
1993 (Peter M. Milling) No address
1992 (John D. Sterman) No address
1990 (Peter Gardiner) No address
1989 (Eric F. Wolstenholme) No address
1977-1988 (Nathan B. Forrester) No address
1986-1987 (Dennis L. Meadows) No address
1985-1986 (Jorgen Randers) No address
1984-1985 (David F. Andersen) No address