- Dennis M. Ritchie Location Dennis Ritchie Bell Labs, Rm 2C-517 600 Mountain Ave. Murray Hill, New Jersey 07974-0636, USA dmr@bell-labs.com +1 908-582-3770 (office), +1 908-582-5857 (fax) History 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: When I joined in 1967, Bell ...www.cs.bell-labs.com/who/dmr