James Cummiskey (1850–1925), merchant and political figure on Prince Edward Island
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Edward Cummiskey (died 1976), New York mobster who served as a mentor to Jimmy Coonan, leader of the Westies
ADPCM was developed in the early 1970s at Bell Labs for voice coding, by P. Cummiskey, N. S. Jayant, and James L. Flanagan.