 Earlier books were devoted to the performance of public enterprises, inheritance, social security and the underground economy.Pestieau has held visiting positions at the University of Cornell, London School of Economics, the University of Toulouse, Montreal, Marseille, Paris (1 and 10), Le Mans and Louvain.He has been a consultant to various national and international agencies, including the International Monetary Fund, the World Bank, the OECD and the European Commission.