Born in 1919 in Buenos Aires. Canadian citizen since 1975. Married, 4 children. PhD in physics, Universidad Nacional de La Plata, 1952. Professor of Theoretical Physics, Universities of Buenos Aires and La Plata, 1956-59; of philosophy, Univ. of Buenos Aires, 1957-62. Visiting prof. of philosophy, University of Pennsylvania, 1960-61 and University of Texas (1963); of physics and philosophy, Temple University (1963-64) and U. of Delaware (1964-65); of philosophy, University of Freiburg (1965-66); of philosophy, McGill University (1966-2009). Author of more than 500 scholarly papers and book chapters, and more than 50 books in physics, philosophy, etc. Sample of books (most of them translated into at least one foreign language). Honors: 19 honorary doctorates. Order del Libertador (Períº). Member, Institut International de Philosophie, Académie Internationale de Philosophie des Sciences, Royal Society of Canada, and Academia Nacional de Ciencias (Argentina). Fellow, American Association for the Advancement of Science.