Robert B. Eno, S.S., held his doctorate in theology from Institute Catholique de Paris. His work in ecumenical and historical studies was widely recognized, and he devoted much research to the focal question of doctrinal authority. He was professor of church history at the Catholic University of America. Robert B. Eno, S.S., held his doctorate in theology from Institute Catholique de Paris. His work in ecumenical and historical studies was widely recognized, and he devoted much research to the focal question of doctrinal authority. He was professor of church history at the Catholic University of America.