Gary Arlen Kildall was an American computer scientist and microcomputer entrepreneur who created the CP/M operating system and founded Digital Research, Inc. . Kildall was one of the first people to see microprocessors as fully capable computers rather than equipment controllers and to organize a company around this concept. Although his career in computing spanned more than two decades, he is mainly remembered in connection with IBM's unsuccessful attempt in 1980 to license CP/M for the IBM PC.