|Joan Muysken is Professor of Economics at the Faculty of Economics and Business Administration, Maastricht University, where he teaches macroeconomics and labour economics. He obtained his PhD from the University of Groningen on the aggregation of production functions. He was a Visiting Researcher at the University of Oslo in 1980 (January-March) and in 1983 (January-August) he stayed at the SUNY Buffalo (USA) as an Assistant Professor. He was a Visiting Professor at the Catholic University of Louvain (Belgium) from January-July 1989; at the University of Newcastle, Australia (November-December 1995 and March-April 2000); at the ZEW, Mannheim during March 2000; and at the WZB, Berlin during May 2000. Joan Muysken's research interests include endogenous growth and diffusion of technologies, skill mismatch, job competition, analysis of unemployment.