Principal Horn in Sir Henry Wood's Queen's Hall, London Symphony, London Philharmonic, Royal Opera, Covent Garden, and English National Opera orchestras. Professor of Horn at the Royal College of Music (1882-d.) and the Royal Academy of Music (1897-d.).

Part of what was later known as "God's own [horn] quartet," Borsdorf, along with 40 other members, helped to found the London Symphony Orchestra.

With a very high standard of playing, he revolutionized horn teaching in England; among his pupils were Alfred and Aubrey Brain, and Frank Probyn.