Donald Leslie OBITUARY Donald James Leslie, who created and manufactured a speaker that refined the sound of the Hammond organ and others and helped popularize electronic music, has died. He was 93.

Two years later in 1939, the African-American founder of the First Church of Deliverance in Chicago, the charismatic and dynamic Rev. Clarence H. Cobbs, decided to purchase a Hammond organ and Leslie ...

Leslie later founded Electro Music in Pasadena to manufacture his speaker, which he called a Leslie speaker. It popularized electronic music during the 1940s by improving the sound of organs and ...

The popularity of his speaker invention earned him several awards, including one from Hammond in 1978 that stated “Donald J. Leslie – In recognition of his outstanding contribution and dedica ...