Keller also studied with Anton Witek in Prague (1912) and Leopold Auer in St. Petersburg, Russia (1913 to 1914).
[1] Keller served in the United States Army during World War I, acting as leader of the 301st Artillery Band in France,[2] and received the French Legion of Honor.
Keller joined the faculty of New England Conservatory of Music in 1921 as head of the violin department.
[1][3] In 1974, New England Conservatory created and endowed the Harrison Keller String Quartet in his honor.
Keller received honorary doctorates from Bethany College in 1954, Hartt School of Music in 1955, and New England Conservatory in 1959.