From Tuorla Observatory, Finland:

• Leo Takalo
• Aimo Sillanpää
• Tapio Pursimo
• Harry Lehto
• Mauri Valtonen
• Kari Nilsson
• Pekka Teerikorpi
• Pekka Heinämäki
• Markku Lainela
• Seppo Katajainen
• Esko Valtaoja

From Instituto de Astrofisica de Canarias (IAC), Spain:

• Mark Kidger
• Nicolas Gonzales-Perez
• J.-M. Rodriguez-Espinoza
• T. Mahoney

From Stittsville, Canada:

• Paul Boltwood

From Instituto de Astronomia-UNAM, Mexico:

• Deborah Dultzin-Hacyan
• Erika Benitez
• Jose-Antonio de Diego

From Department of Astronomy at Indiana University, USA:

• G.W. Turner
• J.W. Robertson
• R.K. Honeycut

From Crimean Astrophysical Observatory, Ukraine:

• Yuri Efimov
• N. Shakhovskoy

From Department of Astrophysics at University of Oxford, England:

• Phil Charles

From Hamburger Sternwarte at Hamburg Universität, Germany

• K.J. Schramm
• U. Borgeest
• J.V. Linde
• W. Weneit
• D. Kuhl
• T. Schramm

From Department of Physics at University of Colorado - Denver, USA:

• Alberto Sadun

From Capilla Peak Observatory, University of New Mexico, USA:

• R. Grashuis

From Landessternwarte Königstuhl, Heidelberg, Germany:

• Jochen Heidt
• S. Wagner
• H. Bock
• M. Kummel
• A. Heines
• M. Pfeiffer

From Instituto Astronomico, Universita di Perugia, Italy:

• Massimo Fiorucci
• Gino Tosti

From Osservatorio Astronomico di Torino, Italy:

• C.M. Raiteri
• M. Villata
• G. De Francesco
• L. Lanteri

From Osservatorio Astronomico di Brera, Italy:

• G. Ghisellini

From The Astronomer Organization, Birmingham, England:

• G.Poyner

From Boston University, USA:

• A. Marscher

From Florida International University, USA:

• Jim Webb

From Space Telescope Institute, Baltimore, USA:

• Elena Pian

From University of Michigan, USA:

• M.F. Aller
• H.D. Aller
• P. Hughes

From Metsähovi Radio Research Station, Finland:

• Harri Teräsranta
• Merja Tornikoski