| 2006 |
J.P. Pichamuthu (India) |
| 2004 |
I. Holleman, (Netherlands)
H. Beekhuis (Netherlands) |
| 2003 |
U. Baltensperger (Switzerland)
M. Gysel (Switzerland)
E. Weingartner (Switzerland) |
| 2002 |
R. Philipona (Switzerland) |
| 2001 |
U. Görsdorf (Germany)
V. Lehmann (Germany) |
| 2000 |
E.R. Westwater (USA)
Yong Han (USA)
J.B. Zinder (USA)
J.H. Churnside (USA)
J.A. Shaw (USA)
M.J. Fakks (USA)
C.N. Long (USA)
T.P. Ackerman (USA)
K.S. Gage (USA)
W.L. Ecklund (USA)
A.C. Riddle (USA) |
| 1999 |
B.E. Goodison (Canada)
P.Y.T. Louie (Canada)
D.Yang (Canada9 (visiting research scientist from China) |
| 1998 |
V.S. Golubev (Russian Federation)
D.A. Konovalov (Russian Federation)
A.Yu. Simonenko (Mrs) (Russian Federation)
Yu.V. Tovmach (Russian Federation) |
| 1997 |
B.W. Forgan (Australia) |
| 1996 |
D.S. Zrnic (USA)
A.Ryzhkov (USA) (visiting scientist from the Russian Federation) |
| 1995 |
A.C.L. Lee (UK) |
| 1994 |
D.J. Gaffen (Mrs) (USA) |
| 1993 |
J.P. van der Meulen (Netherlands) |
| 1992 |
D.J. Griggs (UK)
D.W. Jones (UK)
M. Ouldridge (UK)
W.R. Sparks (UK) |
| 1991 |
M. Kitchen (UK) |
| 1990 |
P.T. May (Australia)
K.P. Moran (USA)
R.G. Strauch (USA) |
| 1989 |
D. Sonntag (Germany) |
| 1988 |
J. Nash (UK)
F.J. Schmidlin (USA) |
| 1987 |
B. Sevruk (Switzerland) |
| 1986 |
C.G. Collier (UK) |
