Paul is well known for his associations with pianist/vocalist Diana Krall and guitarist Russell Malone. Paul has performed with jazz greats Joe Williams, Cab Calloway, Marian McPartland, Barry Harris, Jeff Hamilton, Benny Golson, Benny Green, Jon Hendricks, Wycliff Gordon, Mulgrew Miller, Jay McShann and James Moody. He has played on over 50 CDs with artists such as Larry Vuckovich, Eddie Higgins, and Marcus Belgrave. Paul was honored by the West Michigan Jazz Society as their 2001 Jazz Musician of the Year and by the Detroit Music Awards as the 2002 Outstanding Jazz Instrumentalist. Keller is on the faculty of the Wayne State University jazz department in Detroit. He travels frequently, giving jazz concerts, workshops and clinics and is well-respected as an innovative and enthusiastic jazz educator.