After completing graduate work at Columbia University in 1967 under the guidance of Norman Newell, he was immediately hired by Harvard University where he worked until the end of his life (1967–2002).
Despois de completar os seus estudos de posgraduado na Universidade de Columbia en 1967 baixo a dirección de Norman Newell, foi contratado de inmediato pola Universidade Harvard, onde traballou ata o final da súa vida (1967-2002).