He placed the need to exploit solar energy for diverse purposes on the Weizmann Institute and national agenda. Returning later to the basic aspects of nuclear reactions, he and his colleagues represented Israel at GALLEX, an experiment conducted by an international team in an underground laboratory in Italy’ Gran Sasso region, with the aim of measuring the flux of neutrinos, fundamental particles that reach the earth from the core of the sun. On the international scene, he served as a member of the Scientific Advisory Committee of the United Nations’ International Atomic Energy Agency in Vienna (1973-1981) and was a member of the Executive Committee of the International Energy Agency's SolarPACES project (1991-1993).