| 11/27–11/28/1981: | Co-Organizer of the Congress “Medizinische Informatik 81” in Vienna/Austria |
| 8/19–8/22/1991: | Secretary General of the Tenth International Congress for Medical Informatics in Europe MIE’91 in Vienna/Austria |
| 8/31/1991: | Organizer of the Pre-Congress Meeting “Knowledge-Based Systems in Nuclear Medicine V” of the European Association of Nuclear Medicine Congress in Vienna/Austria |
| 4/21–4/24/1992: | Co-Organizer of the Symposium “Fuzzy Sets, Approximate Reasoning, and Knowledge-Based Systems” at the Eleventh European Meeting on Cybernetics and Systems Research in Vienna/Austria |
| 4/5–4/8/1994: | Co-Organizer of the Symposium “Fuzzy Sets, Approximate Reasoning, and Knowledge-Based Systems” at the Twelfth European Meeting on Cybernetics and Systems Research in Vienna/Austria |
| 6/22/1995: | Organizer of the Workshop “Virtual Reality und Medizin” at the Symposium “The Human Dimension in Health Care”, University of Vienna Medical School, Vienna/Austria |
| 12/7/1995: | Co-Organizer of the Symposium “Digitale Bildverarbeitung im Neuen AKH Wien”, Vienna/Austria |
| 4/9–4/12/1996: | Co-Organizer of the Symposium “Fuzzy Sets, Approximate Reasoning, and Knowledge-Based Systems” at the Thirteenth European Meeting on Cybernetics and Systems Research in Vienna/Austria |
| 11/21/1996: | Co-Organizer of the First Symposium “Medizinische Experten- und wissensbasierte Systeme am AKH Wien”, Vienna/Austria |
| 4/14–4/17/1998: | Co-Organizer of the Symposium “Fuzzy Sets, Approximate Reasoning, and Knowledge-Based Systems” at the Fourteenth European Meeting on Cybernetics and Systems Research in Vienna/Austria |
| 9/30/1998: | Co-Organizer of the Second Symposium “Medizinische Experten- und wissensbasierte Systeme und computergestützte OP-Navigation am AKH Wien”, Vienna/Austria |
| 8/27–8/29/1999: | European Organizer of the International Symposium on “Medical Informatics and Fuzzy Technology MIF ’99” in Hanoi/Vietnam |
| 4/25–4/28/2000: | Co-Organizer of the Symposium “Fuzzy Systems, Approximate Reasoning and Knowledge-Based Systems” at the Fifteenth European Meeting on Cybernetics and Systems Research in Vienna/Austria |
| 5/11–5/12/2000: | Organizer of the First Workshop “Fuzzy Diagnostic and Therapeutic Decision Support in Medicine” under the patronage of ERUDIT—European Network in Uncertainty Techniques Development for Use in Information Technology, supported by the European Commission DG III Industry-Esprit Programme as a Network of Excellence, in Vienna/Austria |
| 10/5/2001: | Organizer of the Workshop “Intelligent Systems in Patient Care” under the patronage of EUNITE—The European Network on Intelligent Technologies for Smart Adaptive Systems (a project funded by the Future and Emerging Technologies Arm of the IST Programme FET K. A. Line 8.12 Networks of Excellence and Working Groups) and the Austrian Society for Artificial Intelligence (ÖGAI—Österreichische Gesellschaft für Artificial Intelligence) |
| 4/2–4/5/2002: | Co-Organizer of the Symposium “Soft Computing and Knowledge-Based Systems” at the Sixteenth European Meeting on Cybernetics and Systems Research in Vienna/Austria |
| 4/13–4/16/2004: | Co-Organizer of the Symposium “Soft Computing and Knowledge-Based Systems” at the Seventeenth European Meeting on Cybernetics and Systems Research in Vienna/Austria |
| 4/18–4/21/2006: | Co-Organizer of the Symposium “Soft Computing and Knowledge-Based Systems” at the Eighteenth European Meeting on Cybernetics and Systems Research in Vienna/Austria |
| 8/30–9/2/2009: | Scientific Program Committee Chair of the 22nd International Congress of the European Federation for Medical Informatics MIE 2009 in Sarajevo/Bosnia & Herzegovina |
| 5/22/2014: | Co-Organizer of the Workshop "HL7-Standards zur medizinischen Wissensverarbeitung: Arden-Syntax und ArdenML" at the eHealth 2014 in Vienna/Austria |
| 6/18/2015: | Co-Organizer of the Workshop "Klinische Entscheidungsunterstützung in der Praxis – HL7 Standards, Interoperabilität und ausgewählte Anwendungen" at the eHealth 2015 in Vienna/Austria |
| 6/24/2016: | Co-Organizer of the Workshop "Clinical Decision Support in Practice – HL7 Standards, Interoperability and Selected Applications" at the eHealth 2016 in Vienna/Austria |
| 5/23/2017: | Co-Organizer of the Workshop "Clinical Decision Support in Practice – HL7 Standards, Interoperability and Selected Applications" at the eHealth 2017 in Vienna/Austria |