 He was subsequently named Executive Assistant to the Administrator, and Director of the Office of European Promotions from 1974 to 1977.After Fomento, Riefkohl joined the University of Puerto Rico at Bayamón as a member of its faculty from 1977 to 1985 and from 1993 to 1994 where he taught social sciences, international organizations, legislative process, government of Puerto Rico and of the United States.In 1971 he wrote the book