Von 1942 bis 1946 war er Director des New England Conservatory of Music und kehrte 1946 an die Yale University zurück, wo er bis 1965 als Professor lehrte. ###>In 1938 later Porter became dean (1938–42) and then director (1942–46) of the New England Conservatory of Music, and in 1946 returned to Yale, as professor, to teach until 1965.