Polak, Jacques Jacobus (Born 1914)
Born in Rotterdam, Polak was educated at the University of Amsterdam, where he obtained an MA (Econ.) degree in 1936, and a PhD (Econ.) in 1937. His early research work as an economist with the League of Nations was concerned with the study of business cycles and he assisted Jan Tinbergen in the latter’s work on business cycles under the sponsorship of the League of Nations. Later they co-authored Polak and Tinbergen (1950).