1942 Seattle [USA]

He was the creator of the CP/M operating system and founder of Digital Research, Inc., which refused to license the rights to its operating system to IBM, instead opting for Microsoft's DOS operating system, which would end up pushing it out of the market.
Paradoxically, years later, his company, Digital Research, released a version of DOS called DR-DOS, at the end of the operating system's lifespan, which enjoyed some success.

He also developed PL/M, the first high-level programming language for microprocessors, and the language in which the CP/M operating system was originally developed. Many Intel-based embedded systems and the Zilog Z80 were programmed in PL/M.

He also worked in popular science and from 1983 to 1990 co-hosted the television program Computer Chronicles on PBS. The program discussed computing and cyber trends, chronicling the rise of the personal computer from its inception to a major market.