Stelios Negrepontis, born 22 February 1939, Ph.D. in Mathematics at University of Rochester, N.Y,1965. Assistant Professor at Indiana University, Bloomington, 1965, Assistant & Associate Professor at McGill University, Montreal, 1966-1976, Professor, Athens University, 1973-2006, Professor Emeritus, 2006-. Chairman, Mathematics, 1983-1989, 1992-1994 and Vice Rector 1986-1988 of Athens University. Specializes in ultrafilters, topology, Banach spaces, infinitary combinatorics, history and philosophy of Mathematics, especially Plato and Pythagoreans.