Entry from the Gilder-MusicWeb Dictionary of Composers with brief biography and chronological list of works.

Brief biography noting stylistic tendencies, studies, and output of works from the Grove Concise Dictionary of Music entry at WQXR radio.

Listing of his clarinet works noting instruments used and related works by others.

Article from Oxford University Press with photograph, catalogue of works, discography, and MP3 audio sample.

Brief biography from ClassicalPlus with complete audio of selected works and purchase information.

Details of his requiem Lux Aeterna with details of his life and other works. Includes photograph.

Digest of reviews from Classics Today with cover art and purchase information.

Biographical article by by David Wright for MusicWeb with photography, recommended recordings, and information on the recording prize named for him.

Listing at The Lied and Art Song Texts Page with lyrics to selected vocal works.