Christopher Cesar Portugal, best known as Thes One, was one half of hip hop duo People Under the Stairs, serving as a vocalist/MC, producer, engineer 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.

People Under the Stairs was an American hip hop duo from Los Angeles, California, formed in 1997 and disbanded in 2019. Since their inception, the group consisted solely of Christopher Portugal and Michael Turner. The group employed a DIY work ethic of sampling, MCing, DJing, and producing all of their output.