Better known as 'dmr'. (1941-2011)
The "R" in KernighanAndRitchie or K&R (as in the K&R dialect of "C").
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.