Donald Leslie
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Donald James Leslie, (April 13, 1911, Danville, Illinois - September 2, 2004, Altadena, California) created and manufactured the Leslie speaker that refined the sound of the Hammond organ and helped popularize electronic music.
Leslie experimented with devices to, in his words, improve the sound of the Hammond organ, based on experience he gathered from other jobs, including fixing radios and one at the Naval Research Laboratory in Washington, D.C., during World War II.
When Leslie presented Hammond with his hand-made organ speaker, the company rejected it. Leslie then chose to manufacture his Leslie speaker on his own. It was used frequently on psychedelic and rock music of the 1960s and 1970s. It has since made its way into many genres of music, including pop music and jazz. It wasn't until the 1980s that Hammond bought Leslie's product to include with their organs.
Leslie was inducted into the American Music Conference Hall of Fame in 2003.