Organizer, Invited Paper Session entitled "Is Distribution Theory still Relevant?", in the "59th World Statistics Congress of the International Statistical Institute", Hong Kong, China, August 25-30, 2013
Associate Editor of the Journal Applied Stochastic Models in Business and Industry (2002 - )
Associate Editor of the Journal Statistical Distributions and Applications (2013 - )
Reviewer, Research Grants Council (RGC), Hong Kong (2009 - )
Organizer, Invited Paper Session entitled "Reflections on the Past, Present and Future of Statistics ", in the "58th World Statistics Congress of the International Statistical Institute", Dublin, Ireland, August 21-26, 2011
Organizer, Special Topic Session entitled "Democracy and Statistics", in the "58th World Statistics Congress of the International Statistical Institute", Dublin, Ireland, August 21-26, 2011
Visiting Scholar, Department of Statistics, UC Berkeley. 2005-2014
Program Committee of the project European Citizens' Consultations, Athens, March 14-15, 2009 which took place in all European Countries from February 10 to March 25, 2009
Chief Editor, Journal of Quality Technology and Quantitative Management, 2004-2006
Visiting Scholar, Department of Statistics at UC Berkeley, August-September 2003
Organizer, Invited Paper Meeting entitled "Stochastic Volatility Modeling: Reflections, Recent Developments and the Future", in the "56th session of the International Statistical Institute", Lisbon, Portugal, August 22-29, 2007
Program Committee of the project European Citizens' Consultations, Nicosia, Cyprus, March 24-25, 2007 which took place in all European Countries from February 10 to March 25, 2007
Program Committee of the project European Citizens' Consultations, Athens, March 10-11, 2007 which took place in all European Countries from February 10 to March 25, 2007
Chair, Invited Plenary Session (Plenary Lecture 2: Three Families of Distributions Based on Simple Initial Distributions and My Two Favourite Simple Initial Distributions), International Conference on Mathematical and Statistical Modeling in Honor of Enrique Castillo (ICMSM 2006), Ciudad Real, Spain, June 28-30, 2006
Board of Examiners for adjudication of a thesis for the degree of D.Sc. in Statistics, University of Calcutta, January 2006
Program Committee of the 3rd world conference on Computational Statistics & Data Analysis, October 2005, 28-31, Limassol, Cyprus
International Advisory Board, International Conference on Statistics in Health Sciences, June 2004, 23-25, Nantes; France
International Program Committee, Computational Management Science Conference and Workshop on Computational Econometrics and Statistics, 2-5 April, Neuchatel, Switzerland, 2004
Scientific Committee, biennial Hellenic European Research On Computer Mathematics And Its Applications Conference since 1988
Scientific Committee, International Workshop on Computational Management Science, Economics, Finance and Engineering, Limassol, Cyprus, March 2003
Visiting Professor, Department of Statistics, Trinity College, University of Dublin, Eire, 2002-2003
Chair, Accreditation Committee formed by the Accreditation Council of the Ministry of Education and Culture of Cyprus for the evaluation of B.A. & B.Sc. programs in Accounting, Banking and Finance, Economics, Marketing of tertiary education institutions in Cyprus, November 1997
Vice Chair, Accreditation Committee formed by the Accreditation Council of the Ministry of Education and Culture of Cyprus for the evaluation of Business programs offered by tertiary education institutions in Cyprus, (BBA and MBA programs), 1997-2010
Chair of one of the Sessions of the SESS-TIES ’99 International Conference, “Envirometrics and Statistics in the Earth and Space Sciences”, Athens, Greece, August 1999
Chair, Committee for the Revision of the Consumer’s Price Index of Greece for 1996
Chair of one of the Sessions of the 49th Session of the International Statistical Institute, Firenze, Italy, September 1993
Invited Visiting Scholar, Mathematical Institute of the Hungarian Academy of Sciences, Budapest, Hungary, July 1990
Invited Visiting Scholar, Statistical Institute of Mathematics. Tokyo, Japan, September 1987
Consultant to the Statistical Office of the European Community (EUROSTAT), 1987
Acting as referee for several International Statistical Journals
Supervised several Ph.D. and M.Sc. Theses
Acted as External Examiner for, two Ph.D. Theses
Member of Several Ph.D. Committees
Member of the Local Organizing Committee and Chair of one of the Sessions of the 17th European Meeting of Statisticians, held in Thessaloniki, Greece, August 1987
Regular Reviewer for Zentralblatt fur Mathematik, Mathematical Reviews, Biometrics, Journal of the Royal Statistical Society
Chair of one of the Sessions of the International Conference on Statistical Distribution in Scientific Work. Trieste, Italy. August 1980
Member, Organizing Committee, Stochastic Modeling Conference, held in Dublin in May 1980
Chair of one of the Sessions of the Missouri Statistical Conference. Columbia, Missouri. April 1980
Invited Visiting Scholar, Department of Probability and Statistics, University of Sheffield, UK, Summer 1979