Jim Marshall was in a full body cast as a 12-year-old boy due to polio. He managed to overcome the incredible odds to not only walk again, but also to become a trained tap dancer. He founded a charity to help crippled children and tap danced at charity events to raise money for the cause. Of course along the way Jim designed and produced the revolutionary guitar amplifiers with his name, that forever changed the way rock and roll was heard. He played a major role in the growth and expansion of the music products industry and spent many trade shows shaking hands and posing for photographs.