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. Mr. Leslie died Sept. 2 ...

Donald James Leslie, who created and manufactured a speaker that refined the sound of the Hammond organ and helped popularize electronic music, died of natural causes September 2 in Altadena, Calif.

LESLIE-Donald James Leslie, Born Danville, Illinois, April 13, 1911, Passed away September 2 at home at the age of 93. Parents were Benjamin Franklin Leslie, and Lucy Keller Leslie. Preceeded in death ...