| scientific circle | CISM -International Center of Mechanical Sciences | | Chairman | 01/1993
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| International Center of Mechanical Sciences (CISM), Udine, Italy |
| scientific committee/curatorship/institute | CISM, Academic Assembly | Italy (South Tyrol) | Member | 01/1993
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| Member |
| scientific committee/curatorship/institute | CISM, Board of Directors | Italy (South Tyrol) | Member | 01/1993
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| Member |
| scientific committee/curatorship/institute | CISM, Scientific Council | Italy (South Tyrol) | Member | 01/1985
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| Mitglied seit 1993 Rector |
| scientific committee/curatorship/institute | EPF Lausanne, Evaluation Committee | Switzerland | Chairman | 01/1998
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12/1998 | PresidentDept. of Mech. Eng. |
| scientific committee/curatorship/institute | ETH Zürich, Evaluation Committee | * | Chairman | 01/1998
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12/1998 | PresidentDept. of Mech. and Process Eng. |
| scientific circle | Euromech | * | Member | 01/1975
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12/1995 | Euromech Korrespondent |
| scientific circle | European Fluid Mechanics Conference Committee | * | Member | 01/1992
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12/1997 | Mitglied |
| scientific committee/curatorship/institute | Evaluation Committee, Zentrum f. Raumfahrttechnologie und Mikrogravitation, Bremen | Germany | Chairman | 01/1994
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12/1994 | Chairman |
| scientific circle | Fachausschuss Wärme- und Stoffübertragung, GVC-VDI | Germany | Member | 01/1986
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| Mitglied 1986-2002, Ständiger Ehrengast 2003 - |
| scientific circle | Fachbeirat, Max-Planck-Institut für Strömungsforschung, Göttingen | Germany | Member | 01/1983
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12/1993 | Mitglied |
| scientific committee/curatorship/institute | IFAC (International Federation of Automatic Control)-Beirat Österreich | Austria | Member | 01/1998
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| Mitglied |
| scientific committee/curatorship/institute | International Center of Mechanical Sciencies (CISM) | Italy (South Tyrol) | Chairman | 01/1993
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| Rector |
| scientific committee/curatorship/institute | International Congress Committee, IUTAM | * | Member | 01/1982
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12/1990 | Mitglied |
| scientific committee/curatorship/institute | International Scientific Advisory Board, FaxénLaboratoriet, KTH | | Member | 01/2002
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| International Scientific Advisory Board, FaxénLaboratoriet, KTH, Stockholm |
| scientific committee/curatorship/institute | International Scientific Advisory Board, FaxénLaboratoriet, KTH Stockholm | Sweden | Member | 01/2002
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| Mitglied |
| scientific committee/curatorship/institute | Kuratorium, Forschungsstelle für Integrierte Sensorsysteme, ÖAW | Austria | Member | 01/2003
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12/2004 | Mitglied |
| scientific committee/curatorship/institute | Kuratorium, Institut für Schallforschung, ÖAW | Austria | Member | 01/1999
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| Mitglied |
| scientific committee/curatorship/institute | Kuratorium, Institut für Technikfolgen-Abschätzung, ÖAW | Austria | Chairman | 01/1996
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01/0199 | Obmann Stellvertreter |
| scientific committee/curatorship/institute | Kuratorium, Institut für Technikfolgen-Abschätzung, ÖAW | Austria | Chairman | 01/1999
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| Obmann |
| scientific circle | Vorstandsrat, Gesellschaft f. Angew. Math. u. Mechanik | Germany | Chairman | 01/1980
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12/1988 | Mitglied des Vorstandsrates |
| scientific committee/curatorship/institute | Österreichisches Nationalkomitee f. Theoretische und Angwandte Mechanik | Austria | Chairman | 01/1984
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12/1993 | Obmannstellvertreter (Deputy Chairman)Österreichisches Nationalkomitee für Theoretische und Angewandte MechanikAustrian National Committee for Theoretical and Applied Mechanics |
| scientific committee/curatorship/institute | Österreichisches Nationalkomitee für Theoretische und Angewandte Mechanik | Austria | Member | 01/1984
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| MitgliedÖsterreichisches Nationalkomitee für Theoretische und Angewandte MechanikAustrian National Committee for Theoretical and Applied Mechanics |