Doctoranous, Doctoraat Netherlands School Economics, 1953, 1964.
Senior Lector, Research Fellow, Director, Netherlands Economics Institute, Institution, 1953-1965, 1951-1968, 1960-1978. Visiting Research Fellow, Cowles Foundation, Yale University 1961. Professor Development Planning and Economics of Centrally Planned Systems, Erasmus University, Rotterdam, Netherlands, since 1965.
Editorial Board, J. Policy Modeling.
(Great economics book!)
I have started research on such diverse subjects as income distribution in the USSR, methodological aspects of monetary analysis, and estimating national income of the Netherlands in the nineteenth century. Since the mid 1950s, I have concentrated my activities on problems of developing countries, in particular the national and international planning aspects: macro planning models, education planning, economic co-operation among developing countries, and appraisal of foreign direct investment. More recently, my interest has shifted to international trade, financial and monetary aspects
of the North-South relations.
Also, since 1965 I have kept an interest in East-European economics.