Dax Reynosa, often mononymously known as Dax and by the former stage name Theory, is an American underground hip hop artist, producer, songwriter, smooth jazz singer, and music manager from Whittier, California. As a hip hop artist, he co-founded the underground Christian hip hop collective Tunnel Rats and the affiliated groups LPG, Footsoldiers, and The Resistance. He also co-founded the Latin funk and R&B band Elé and formed The Dax Band. He has contributed vocals and songwriting to numerous jazz recordings.