• Associate Editor Empirical Economics, 2008 - Present.
• Editor-in-Chief of the International Journal of Forecasting (see: Elsevier Science: ContentsDirect), 1998 - 2004.
• Editor of the International Journal of Forecasting, 1990 - 1997 and 2005 - 2008.
• Associate Editor of the International Journal of Forecasting, 1986 - 1989 and 2008 - present.
• Associate Editor of the Journal of Forecasting, 1982 - 1985.
• Associate Editor of Quantitative Methods (Journal of the Netherlands Society for Statistics and Operations Research), 1995 - 2000.
• Co-Editor, International Journal of Forecasting, Special Issue on Nonlinearities, Business Cycles and Forecasting (Vol 21:4, 2005).
• Co-Editor, International Journal of Forecasting, Special Issue on Forecasting and Seasonality (Vol 13:3, 1997).
• Member International Program Committee, IFAC Symposium on Modeling and Control of Economic Systems, Redlands, California, USA.
• Member Board of Directors of the International Institute of Forecasters, 1988 - 2004.
• General Chairperson of the Eighth International Symposium on Forecasting - held 12 - 15 June, 1988 in Amsterdam, The Netherlands.
• Co-Chairperson of the NBER/NSF Time Series Seminar, held 17 - 19 October, 1996 in Rotterdam, The Netherlands.
• Organizer and General Chairperson of the International Conference on Marketing Statistics - held 29 May, 1991 Amsterdam, The Netherlands.
• Co-Chairperson of the International Conference on Statistical Quality Control in Industry - held 19 March, 1992, Amsterdam, The Netherlands.