Happy Dennis M. Ritchie day!

 

Dennis MacAlistair Ritchie (September 9, 1941 – c. October 12, 2011) was an American computer scientist.

He created the C programming language and, with long-time colleague Ken Thompson, the Unix operating system and B programming language.

What is (was) UNIX?

Well, here is a simple explanation from the creators themselves ;)



Here is another blogg-post about UNIX:
http://blog.pizslacker.org/2009/09/brief-little-unix-history-video.html