Bachelor of Music, DePauw University, 1958. Master of Music, Philadelphia Conservatory Music, 1962. Doctor in Musical Arts, University Illinois, 1971.
Doctor of Music (honorary), DePauw University. Doctor of Music (honorary), Ursinus College. Doctor of Music (honorary), Vincennes University.
Doctor of Humane Letters (honorary), Purdue University.
Director choral activities DePauw University, Greencastle, Indiana, 1964—1968, Florida State University, Tallahassee, 1968—1971. Maestro del coro Spoleto Festival, Italy, 1971—1993. Artistic director Westminster Choir College, Princeton, New Jersey, 1971—2004.
Choral director New York Philharmonic, New York City, since 1971. Artistic director Spoleto Festival United States of America, Charleston, South Carolina, since 1978. Music director Singing City, Philadelphia, 1996—2000.
Visiting professor University Indiana, Bloomington, 1988. Visiting distinguished professor DePauw University, Greencastle, 2005.