Renowned American jazz trombonist and composer, Rich Matteson (1929-1993), was a pivotal figure in the development of jazz education and the evolution of the euphonium as a jazz instrument. His innovative playing and teaching at the University of North Texas solidified his legacy as a significant influence on countless jazz musicians. Matteson's compositions and arrangements, often showcasing his mastery of the valve trombone and euphonium, remain celebrated for their melodic invention and sophisticated harmonic language.