Powell har blant annet spilt med Art Farmer, Eddie Daniels, Jeff Berlin, Hadrian Feraud, Lorenzo Feliciati, Reggie Washington, Bobby Shew, Bob Wilber, Phil Wilson, Anthony Braxton, Vince Mendoza, Mike Gibbs, Iain Ballamy, Martin France, Frode Berg, Erik Smith, Arild Andersen, Terje Rypdal, Mike Walker, Sigurd Køhn, Jarle Vespestad, Nils Olav Johansen, Roy Hargrove, Dave Liebman, Nils Petter Molvær, Chad Wackerman, Pat Mastelotto, Bill Laswell, Tony Levin, Graham Haynes, Cuong Vu, Jacob Young.