After 50 Years, Marshall Amps Will Now Rock On Without Their LeaderMario Aguilar4/05/12 3:20pm21EditPromoteGo to permalinkLadies and gentlemen, please lower your amplifiers to half-volume. The world lost a monster of rock and roll today. Jim Marshall, the founder of Marshall Amplification, passed away after years of battling cancer and strokes. He was 88. And a legend.