Bachelor of Arts (Economics Statistics), Master of Arts Hebrew University, 1959, 1961, Doctor of Philosophy Massachusetts Institute of Technology, Cambridge, Mass., USA, 1964.
Visiting Professor, Uni vs., Stanford, Pennsylvania, Illinois, Amsterdam. Professor of Economics, Hebrew University Jerusalem, since 1964.
The fields of capital theory, growth models, and dynamic models of optimisation. Studied growth models with various kinds of technological change and their economic implications. More recently studied exploitation of exhaustible or renewable resources, optimal accumulation under uncertainty, inflation and indexed bonds markets.