See UnixOperatingSystems and InventorsOfUnix. DennisRitchie's home page, http://www.cs.bell-labs.com/who/dmr/, has TheEvolutionOfTheUnixTimeSharingSystem among other things.
See also:
-- Discussion moved from InventorsOfUnix:
Unix was originally a "lite" version Multics. Techies loved Multics, but it was too expensive and too slow at the time, generally ahead of its time. Many of the concepts of Unix come from Multics as Multics fans tried to recreate what they loved about Multics on cheaper hardware and with a smaller profile.
s/Unix/Linux/g;s/Multics/Unix/g;
What is this?
it's SedLanguage that results in the output
"Linux was originally a "lite" version Unix. Techies loved Unix, but it was too expensive and too slow at the time, generally ahead of its time. Many of the concepts of Linux come from Unix as Unix fans tried to recreate what they loved about Unix on cheaper hardware and with a smaller profile."
when applied to the above text
{History repeats itself :-}