[1][2][3][4] Dorff graduated magna cum laude from Cornell University and earned his master's degree in composition from the University of Pennsylvania, studying composition with George Crumb, George Rochberg, Karel Husa, Henry Brant, Ralph Shapey, Elie Siegmeister, and Richard Wernick.
[7][8] His works have been commissioned by such ensembles as the Philadelphia Orchestra and Minnesota Orchestra, and performed by groups and individuals including the Baltimore Symphony, Eastman Wind Ensemble, flutists and clarinetists of the Chicago Symphony and Berlin Philharmonic, pianist Marc-André Hamelin, and flutists Jean-Pierre Rampal, Jasmine Choi, Denis Bouriakov, and frequent collaborator Cindy Anne Broz.
He has also created arrangements for Sir James Galway[9] and pop musicians Keith Emerson[10] and Lisa Loeb.
Dorff has written many frequently-performed recital works for woodwinds, and music for orchestra, concert band, piano, chorus, and chamber ensembles, including often-neglected instruments such as contrabassoon, bass clarinet, and tenor saxophone – the best-known of which is In A Deep Funk, a dance suite for unaccompanied contrabassoon or bass clarinet.
Dorff has taken a particular interest in exposing young people to classical music; many of his works are written for young audiences,[11] including Three Fun Fables, a setting for narrator and orchestra of familiar Aesop tales; Billy and the Carnival, a narrated guide to the instruments of the orchestra; Blast Off!, a travelog of a trip to outer space (the score to which was flown by NASA on the 100th mission of the Space Shuttle); and familiar stories such as Goldilocks and the Three Bears, The Three Little Pigs, and The Tortoise and the Hare, and Stone Soup: An Operatic Fable in One Delicious Act which has enjoyed well over 1000 performances.