 He was on the faculties of The Juilliard School of Music and Mannes College The New School for Music in New York and Boston University, and was a lecturer, teacher and master class leader at other universities and conservatories around the world.His language and diction classes are taught at Juilliard, Eastman School of Music, Indiana University, New York University, Metropolitan Opera, New York City Opera, Chicago Opera, Pittsburgh Opera, the Opera NUOVA Vocal Intensive Program in Edmonton, Alberta, and American Institute of Musical Studies, Graz, Austria.He and his third wife, Carol Cates Castel, a voice teacher and stage director, taught on the faculty of the Spoleto Vocal Arts Symposium in Spoleto, Italy.