Dennis M. Ritchie


DMR picture


I work in the Computing Sciences Research Center of Bell Labs, and have for a long time. This experience has been more varied than it might seem; here's some of the history:

Old Bell System logo
When I joined in 1967, Bell Labs was a corporation jointly owned by American Telephone and Telegraph Company and its subsidiary Western Electric. Its official name was Bell Telephone Laboratories, Incorporated.

New Bell System logo
Soon after, Ken Thompson, together with me and others, first started work on Unix. Also soon after, AT&T, which still owned most of the Bell System, updated its logo (I doubt the events were related). The new logo just updated the image; corporate structure remained the same. The material published by us during the period up to 1984 used this Bell logo and the name "Bell Laboratories."

AT&T logo
In 1984, AT&T, under a negotiated consent decree, divested the local telephone companies it had owned and in the process gave up the Bell logo and the Bell name except in connection with Bell Laboratories. Bell Telephone Laboratories Inc. was dissolved as a corporation and became an integrated unit of AT&T. We lost the Wehrmacht helmet and gained the Deathstar, and now identified ourselves as working at "AT&T Bell Laboratories."

Lucent logo
In 1996, AT&T (this time voluntarily) spun off its systems and technology organizations into Lucent Technologies, while AT&T kept the services business. Bell Labs stayed mostly with Lucent, though some of our colleagues helped form a new AT&T labs, much as some of us went to Bellcore in 1984. The new corporate logo usually includes the line "Bell Labs Innovations."

Bell Labs remains a remarkably good place to do work that has enduring impact over the long run, no matter what the company, the courts, and PR types decide should be our name and logo on a given day or year.

Some material

Various things I've been involved with are available in HTML, PostScript or PDF. Some are papers of mine or by others, some are just interesting incunabula. They're organized by category.

Unix papers and writings, approximately chronological

C and its immediate ancestors

Interesting other things: architecture, editors, adventures

Plan 9 and Inferno

Links I've gathered


A brief biography, in first person instead of obituary style.


bibtex format or html format .

Last fiddled: March 19 2002, to add the HOPL talk link.