- Catholic University of America 1
- Director of the Latin American Institute at The Catholic University of America from 1965-1982 1
- Jazzpianist. 1
- United States Ambassador to Guatemala (1984–1987). 1
- 1973-2012 Professor für Musiktheorie und Komposition an der Benjamin T. Rome School of Music 1
- Associate professor of Church History and Historical and Systematic Theology in the School of Theology and Religious Studies at The Catholic University of America 1
- David E. Bentley Professor of Political Economy at The Institute of World Politics 1
1957 - , Associate professor of Church History and Historical and Systematic Theology in the School of Theology and Religious Studies at The Catholic University of America
1926 - , David E. Bentley Professor of Political Economy at The Institute of World Politics; Director of the Latin American Institute at The Catholic University of America from 1965-1982; United States Ambassador to Guatemala (1984–1987).
1943 - 2012, 1973-2012 Professor für Musiktheorie und Komposition an der Benjamin T. Rome School of Music; Catholic University of America; Jazzpianist.