Christopher Cesar Portugal, best known as Thes One, is an American rapper, record producer and sound engineer. He was one half of hip hop duo People Under the Stairs, alongside Double K serving as a vocalist/MC and business manager. He has produced and engineered 8 albums for People Under the Stairs that have sold in excess of 100,000 units in the U.S. alone since 2000, have appeared on the U.S. and International Billboard charts numerous times, as well as numerous remixes and singles for other artists across the globe with numerous appearances as guest vocalist. As a business manager, he has coordinated and managed 21+ successful world tours for People Under the Stairs and co-founded the independent artist-run Tres Records label. He also designs and builds recording studios and custom gear. His musical aliases include Lord Radio.