Dennis has performed and recorded with a virtual Who's Who of the jazz world: Clark Terry, George Cables, Bill Holman, Bob Moses, Jim McNeely, Howard Johnson, Gary Bartz, Kenny Werner, James Williams, Don Sickler, Charli Persip, Pete Yellin along with contemporaries Uri Caine, Ingrid Jensen, Johannes Wallmann, Andy Milne, David Binney, Ben Shepherd, Dan Schnelle and Andy Sanesi.
Mitcheltree was born and raised in Wisconsin, picking up the oboe and saxophone at age 12. He received a scholarship from Berklee College of Music where he graduated with a Magna cum Laude degree in Jazz Performance in 1987. He is the Artistic Director for the American Music Group, widely known for the INFLUENCES series presented at Carnegie Hall, and an award-winning saxophonist and composer.
A former student of Joe Viola, Billy Pierce, Jim McNeely, George Garzone and Joe Lovano, Dennis is also a renowned jazz teacher and clinician of jazz improvisation, harmony, composition and saxophone/woodwinds. He teaches privately and as a guest artist/clinician/lecturer at universities and jazz education programs worldwide.