Heidi Castleman teaches viola at The Juilliard School. Formerly faculty at the Cleveland Institute of Music, Eastman School of Music, New England Conservatory, SUNY-Purchase, Rice University, and Philadelphia Musical Academy, she has also taught and performed at the Sarasota Music Festival, Eastern Music Festival, Banff Centre, Blossom Music Festival, Great Mountain Music Festival, Orford Arts Center, Perlman Music Program, and currently at the Aspen Music Festival and Heifetz Institute. She is cofounder and viola faculty of the Quartet program (1970–90). Ms. Castleman is a member of New York String Sextet and guest artist with Cleveland, Audubon, Lydian, and Cavani Quartets. She has given master classes and lecture-demonstrations at the Hochschule für Musik in Vienna and Lubeck, Mozarteum in Salzburg, and in Shanghai, Montreal, Chicago, Dallas, Interlochen, and Boulder. She is founding trustee and president (1983–87) of Chamber Music America, and was named ASTA Ohio Teacher of the Year in 1994. She is also recipient of the 2001 Chamber Music America Richard J. Bogomolny National Service Award; 2002 ASTA with N.S.O.A. National Artist-Teacher of the Year, 2004 AVS Maurice W. Riley Viola Award for Distinguished Contributions to the Viola; and a 2006 honorary doctorate from University of Montreal.

Leave of absence for 2018 season