 He then attended Harvard University, where he finished his master's degree in public administration in 1955.He returned to his country and joined the academe at his alma mater, the University of the Philippines as a lecturer in Economics until 1959 when he transferred to the Far Eastern University as professorial lecturer until 1961.He was rehired by the University of the Philippines as assistant vice president from 1962 to 1963 and then as professorial lecturer of Law and member of the Board of Regents from 1963 to 1966.