Int. Conference on Quantitative Evaluation of Systems (QEST): 2004 Twente (Netherlands), 2005 Torino (Italy), 2006 Riverside (USA), 2007 Edinburgh (UK), 2008 St. Malo (France), 2009 Budapest (Hungary), 2010 Williamsburg (USA)., 2012 London (UK), 2013 Buenos Aires (Argentinia), 2020 Vienna (Austria), 2021 Paris (France)
Int. Conf. on Dependable Systems and Networks (DSN): 2005 Yokohama (Japan), PC-chair 2007 Edinburgh (UK), 2008 Anchorage (USA), 2009 Lisbon (Portugal), 2010 Chicago (USA), 2011 Hong Kong (China), 2012 Boston (USA), 2013 Budapest (Hungary), 2014 Atlanta (USA), 2015 Rio de Janeiro (Brazil), 2016 Toulouse (France), 2017 Denver (USA), 2020 Valencia (Spain), 2021 Taipei (Taiwan)
Int. Workshop on Petri Nets and Performance Models (PNPM): 1995 Durham (USA), 1997 San Malo (France), PC-Co-chair 1999 Zaragoza (Spain), 2001 Aachen (Germany), 2003 Urbana-Champaign (USA) .
Int'l. Conf. on Techniques and Tools for Computer Performance Evaluation (PerformanceTools): 2000 Chicago (USA), 2002 London (UK), 2003 Urbana-Champaign (USA).
Int. Workshop on the Numerical Solution of Markov Chains (NSMC): 1999 Zaragoza (Spain), 2003 Urbana-Champaign (USA), 2010 Williamsburg (USA).
Symp. on Modeling, Analysis and Simulation of Comp. and Telecomm Systems (MASCOTS): 1999 Maryland (USA), 2000 San Francisco (USA), 2001 Cincinnati (USA).
International Conference on Performance Evaluation Methodologies and Tools (ValueTools), 2013, Torino (Italy (PC Co-Chair), 2015 Berlin (Germany), 2016 Taormina (Italy), 2017 Venice (Italy).
Messung, Modellierung und Bewertung von Rechensystemen und -netzen (MMB), September 2001, Aachen (Germany), September 2004, Dresden (PC-Co-Chair), March 2006, Erlangen (Germany), March 2008, Dortmund (PC-Chair & General Chair), March 2010, Essen (Germany), 2012 Kaiserslautern (Germany), 2014 Bamberg (Germany), 2016 Münster (Germany), 2018 (Erlangen), 2020 (Saarbrücken).
Int. Conf. on Leveranging Applications of Formal Methods (IsoLA): 2004 Paphos (Cyprus).
European Dependable Computing Conference, 2010, Valencia (Spain), 2012 Sibiu (Romania), 2014 Newcastle upon Tyne (UK).
Intern. Conference on Matrix Analytical Methods in Stochastic Models MAM , 2014, Calicut (India), 2016, Budapest (Hungary), 2019, Hobart (Tasmania)..
MobiHoc, 2010, Chicago (USA).
Int. Symp. on Computer and Information Sciences (ISCIS): 2004 Antalya (Turkey).
Int. Workshop on Distributed and Parallel Systems: Environments and Tools, Oct. 1996, Budapest (Hungary).
Performance 1996, Lausanne (Switzerland), 2007, Cologne (Germany) Tutorial chair, 2010 Namur (Belgium), 2011 Amsterdam (Netherlands), 2014 Turin (Italy) PC-cochair, 2015 Sydney (Australia).
Sigmetrics/Performance 2006 Saint-Malo (France).
European Simulation Multiconference (ESM'99), June 1999, Warschau (Poland).
Workshop on System Design Automation (SDA), 2002 Pirna (Germany), 2003 Dresden (Germany)
Modellierung 2006 Innsbruck (Austria)
ETFA 2011 Industrial Communication Systems Track, 2011 Toulouse (France), 2012 Krakow (Poland).
Workshop on Factory Communication Systems, June 2006, Torino (Italy), May 2008, Dresden (Germany), 2010, Nancy (France), 2012 Lemgo (Germany), 2014 Toulouse (France), 2015 Palma de Mallorca (Spain), 2016 Aveiro (Portugal), 2017 Trondheim (Norway).
Workshop on Tools for Structured Markov Chains (SMCTools), PC-Chair 2007, Nantes (France), 2008 Athens (Greece), 2009 Pisa (Italy)
Workshop on Advanced Computing for Critical Systems and Emergency Preparedness and Response (WCEMP) 2008, Sao Paulo (Brazil)
International Workshop on Petri Nets Tools and Applications (PNATP); March 2008, Marseille (France)
5th Polish-German Teletraffic Symposium '08, Berlin (Germany).
Workshop on Large Scale System and Application Performance, 2009, Munich (Germany), 2011, Chicago (USA).
Workshop on Computational Stochastics, 2010, Amsterdam (Netherlands).
Workshop on Petri Nets and Software Engineering, 2009, Paris (France).
Int. Workshop on Dynamic Aspects in Dependability Models for Fault Tolerant Systems. 2010, Valencia (Spain)
GI Sicherheit, 2012, Darmstadt (Germany)
Int. Conf. on Dependable Systems and Networks 2008-2010
Int. Conf. on Quantitative Evaluation of System, 2004-2005, 2011-2013, since 2020