Dean Sorenson Dean Sorenson is a prolific and highly sought after composer, trombonist, and clinician. His most recent publication, the Standard of Excellence Jazz Ensemble Method (co-authored with Bruce Pearson), is fast becoming a "must-have" for developing jazz ensembles.      Dean holds degrees from the University of Minnesota and the Eastman School of Music and was recently appointed Interim Director of Jazz Studies and Performance at the University of Minnesota-Minneapolis. He spent two years touring the United States and Japan with the Glenn Miller Orchestra, playing trombone and writing many arrangements for the band. He maintains an active freelance schedule, playing for touring shows and a wide variety of local groups.      Recent commissions have come from the Airmen of Note, Proteus 7, and the Penfield Music Commission Project in Penfield, NY. His compositions and arrangements including the Standard of Excellence Jazz Ensemble Method, are published by the Neil A. Kjos Music Company.