In 1937 he prepared eight successful candidates for the LRSM, something that astounded the examiner. He founded the Bornoff School of Music in the same year and served as director until 1947. In 1945 he began to teach violin and chamber music at the Teachers' College, Columbia U. He lectured in music education and was in charge of string development 1953-73 at Boston U. In 1973 he began teaching violin at the Boston Cons and in the same year he was appointed professor emeritus at Boston U. In 1980 he became executive director of the Foundation for the Advancement of String Education.
Bornoff has been an adjudicator and consultant to music schools and departments of education in Canada, the USA, and Mexico, and has presented string demonstrations and given workshops throughout North America. He is the author of many articles, of Bornoff's Finger Patterns for Violin (Thompson, C. Fischer 1948), and of other instruction treatises. Bornoff has emphasized group study. In 'A word to the teacher' (Bornoff's Finger Patterns for Violin) he states: 'The key to this approach lies in the introduction of the instrument as a whole. Definite objectives for the mastery of the whole violin, from the beginning, will offer a purposeful meaning to a student's practising and will replace the tedious isolation of certain skills and techniques with a musical experience and a sense of accomplishment'.
Bornoff has received several honours, including, in 1974, a Distinguished Service award from the American String Teachers' Association. His pupils have included J. Chalmers Doane, Donna Grescoe, Stanley Kolt, and Gerald Stanick. His wife is the pianist and contralto Mary Ada Baron Bornoff (b Coleman, west of Lethbridge, Alta 6 Jan 1912) who taught at the Bornoff School of Music and appeared in recital in western Canada and New York.