James Johnson and his companies exp llc and 21st Century Audio Systems, Inc provide 3 dimensional audio consulting, research and development, systems design, sound design, acoustic design, recording, mastering and production services. His client roster includes Universal Attractions, MCA Records, Experience Hendrix, EMI, and Flickerhouse Productions.

He has worked with movie director Jan Debont and sound designer Steven Hunter Flick on the movie Twister, performance artists Lauren Bon and Rochelle Fabb, Jimi Hendrix's father, Al Hendrix and musical artists ranging from Les McCann and Grover Washington to Taj Mahal and Monte Montgomery.

Along with Janie Hendrix, he was Executive Producer of the Jimi Hendrix 3D Sound Theater, which debuted at Woodstock '99. Working from the original master tracks he oversaw mixing in 3 dimensions of Jimis’ music, the creation of 3d sound effects, as well as sound system design, architectural design and construction of the theater.

James Johnson has created a unique and unprecedented high definition 3 dimensional sound delivery system called exp3d™, which debuted at the Los Angeles Premier of The Who's "Tommy". Mr. Johnson's work on this theatrical performance of "Tommy" also included the design of live and recorded 3d sound effects, and supervision of the live audio mix.

James Johnson is a member of the Audio Engineering Society