Composer and arranger George Russell is in town to speak at the Philadelphia International Jazz Arts Conference. Russell began his career as a jazz drummer before devoting himself to composing. He has since become central to the development of jazz and 20th century music theory. He has developed his on theory of harmony based on jazz called the Lydian Chromatic Concept of Tonal Organization. Russell has taught at the New England Conservatory of Music in Cambridge, Massachusetts since 1969.