In 1943, she married Adolph Koldofsky, a noted Canadian violinist born in London, England of Russian-Jewish parents.
[1] She gave master vocal classes for singers and taught accompanying at other North American music schools and universities.
[4] Gwendolyn Koldofsky was the accompanist for Lotte Lehmann, Rose Bampton, Jeanne Dusseau, Herta Glaz, Jan Peerce, Hermann Prey, Martial Singher and famed mezzo-soprano Marilyn Horne, a former student of hers [2] Horne, as well as pianist Martin Katz and soprano Carol Neblett, both students of hers.
[1][5] Marilyn Horne recalls her as “Teacher, mentor, accompanist, and my dear friend.” In 2012, the University of Toronto established the Gwendolyn Williams Koldofsky Prize in Accompanying.
[2] Recipients include Lorna Eder,[6] So-Mang Jeagal,[7] Dongeui Park,[8] Hye Jung Shin.