 He has recorded over twenty albums as a leader, ranging from revisitings of music from the 1920s and 1930s to explorations of contemporary idioms in the company Michael Brecker, Kenny Barron, Marty Ehrlich, Bill Charlap, and Uri Caine.He became interested in exploring dissonant, nonstandard harmonies that lie outside of conventional triadic harmony, creating a musical theory of what he calls "metatonality", a harmonic system outlined in his book "Harmony for a New Millennium".He has led the New York All-Stars with Dan Barrett and Ken Peplowski, the Metatonal Band with Marvin Smith and Ted Rosenthal, and has done arrangements for the Carnegie Hall Jazz Orchestra.