He was Rector and Acting President (succeeding Joseph H. Lookstein, and succeeded by Emanuel Rackman) at Bar-Ilan University from 1967 to 1977. He also co-founded the Institute for Philosophy of Science at Tel Aviv University, and was president of the Association for the Advancement for Science in Israel. He was Visiting Professor at the Swiss Federal Institute of Technology in Zürich, the University of Göttingen, the Institut Henri Poincaré, Columbia University, the Catholic University of America in Washington, D. C., and other universities in the United States and Canada.