Dennis MacAlistair Ritchie (username: dmr, September 9, 1941 — October 8, 2011) This post is dedicated to a man that gave a lot to the computer science world, Dennis Ritchie (a.k.a. dmr). He is the creator of the C programming language and the key developer of the Unix operating system. The C programming language is the book he wrote along with Brian Kernighan. In my humble opinion, it is one of the best book ever written about computer programming.