He also studied organ with Frederick Swann and was active as a church organist and choir director in New York throughout his life.
He began teaching at State University of New York, Buffalo in 1967, where he stayed until 1989, becoming full professor in 1979 and serving as chair from 1987-89.
He was also appointed Richard H. Fogel Professor of Music at University of North Carolina at Chapel Hill.
He was the author of five books, including Source Readings in Music History, Music in Early Christian Literature, and The Advent Project: The Later Seventh-Century Creation of the Roman Mass Proper, which attempts to reconstruct the history of plainchant from the Patristics (Early Church Fathers) to the Carolingian period.
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