Since beginning private cello instruction in 2004, Mattison Warren has participated in symphony orchestras, chamber orchestras, honors and all-state orchestras, solo and ensemble competitions, masterclasses, and music camps, as well as countless musical theater productions, chamber groups, weddings, special events, and guest performances with choirs, vocal, percussion, and brass chamber ensembles. Mattison was a finalist in the 2009 Salute to Youth concerto competition with Saint George's Southwest Symphony and has performed solos with several other orchestras and given solo recitals. As a composer of 14 years, Mattison has composed music for short films, weddings, concerts, special events, and recently, a video game (in production).