Domingo Castillo has an extensive background in production which includes a term of nearly 20 years spent at WNUA 95.5, Chicago's former Smooth Jazz station, where he began as an intern and ultimately became an integral member of their Production Staff and Part-Time Airstaff. As a Freelance Producer his work can be heard in several markets including Denver, Ft. Lauderdale, Las Vegas, Tulsa, Fresno, Albuquerque and Houston. Domingo, also a full-time musician, recently began his 13th year of teaching Radio Production at Columbia College.