Per Tom Miller from the Herald's live chat that just ended, Hooker's high school coach is none other than ex-UND player Broderick Powell, and he's assisted by another ex-UND player--Sherrod Russell.
Also, here is a UND Sports Talk blog on the Hooker commitment: http://undathletics.areavoices.com/2012/09/12/und-receives-verbal-from-park-center-guard-quinton-hooker/