Guido Altarelli (July 12, 1941 - September 30, 2015) was an Italian theoretical physicist. He graduated in Physics from Rome University in 1963 with Raoul Gatto whom he followed to the University of Florence (1965–68). He held positions at New York University (1968–69), the Rockefeller University (New York, 1969–70), l’Ecole Normale Superieure in Paris (76-77, 81) and Boston University (85-86).