http://www.cs.bell-labs.com/who/dmr/index.html
Researcher at BellLabs. KenThompson's main collaborator on the UnixOperatingSystem (see InventorsOfUnix). Invented BeeLanguage and then CeeLanguage as part of the Unix effort.
Later involved with PlanNineFromBellLabs, intended as a successor to Unix.
Recipient of 1983 TuringAward.