1st Symposium, 1959 (foundation year)

Alfred Czerny, Austria
Heinrich Deutsch, Austria
Eugène Dodeigne, Belgium
Gerson Fehrenbach, Germany
Janez Lenassi, Yugoslavia 
Peter Meister, Switzerland
Jacques Moeschal, Belgium
Dino Paolini, Italy
Karl Prantl, Austria – founder
Erich Reischke, Germany
Erwin Thorn, Austria
Hans Verhulst, Holland
André Willequet, Belgium
Sepp Wyss, Switzerland

1960

Achiam, Israel/Paris
Herbert Baumann, Germany
Kosso Eloul, Israel
Michael Grossert, Switzerland
Yasuo Mizui, Japan
Josef Pillhofer, Austria
Jakob Savinšek, Yugoslavia
Joachim F. Schultze, Germany
Erwin Thorn, Austria
Olgierd Truszynski, Poland
Hermann Walenta, Austria

1961

Maria Biljan-Bilger, Austria
Auguste Cardenas, Cuba
Ajit Chakravarti, India
Yoshikuni Iida, Japan
Rudolf Kedl, Austria
Günther Roth, Germany
Ursula Sax, Germany
Alina Szapocznikow, Poland
Giorgio Zennarao, Italy

1962

Fritz Hartlauer, Austria
Krishna Reddy, India
Pierre Székely, Hungary
Andreas Urteil, Austria

1963

Milos Chlupác, Czech Republic
Momcilo Krcoviv, Yugoslavia
Karl Prantl, Austria
Erich Reischke, Germany
Barna von Sartory, Hungary
Moshe Schwartz-Buky, Israel
Magdalena Wiecek, Poland

1964

Herbert Baumann, Germany
Milos Chlupác, Czech Republic
Rolf Jörres, Germany
Werner Mach, Austria
Zdenek Palcr, Czech Republic
Karl Prantl, Austria
Sándor Rétfalvi, Hungary
David Thompson, England
Olgierd Truszynski, Poland
Peter Knapp, Germany

1966

Elmar Daucher, Germany
Patricia (Pat) Diska, USA/France
Janez Lenassi, Yugoslavia
Dietrich Lötsch
Zbynek Sekal, Czech Republic
Max Sauk, Germany
Rudolf Uher, Slovakia
Hermann Painitz
Karl Prantl, Austria
Hajime Togashi, Japan
Olbram Zoubek, Czech Republic