Denis Cornell founded Cornell Custom Amplification in 1991. Denis Cornell has built repaired, serviced and custom designed amplification systems for many years. (Sound City's groundbreaking MKIII / IV amp's were co-designed by by Denis along with Brian Hucker)  Over the years Denis has helped design amps for many of today's big brand amp manufacturers. As a freelance consultant Denis Cornell has sorted complex technical problems and helped Fender Europe with new designs. Denis has been called upon to help major companies grow and launch their products and had a key role in Arbiter Group's London facility in designing products for them.