Scott E. Fahlman is a Professor Emeritus at Carnegie Mellon University who was one of the core developers of the common Lisp language and considered the inventor of the sideways smiley face.
Wanted to use the smiley face to mark comments on boards as jokes.
Rarely ever smiles
http://delontin1.wordpress.com/2008/02/27/complete-history-of-hacking/
https://www.cs.cmu.edu/~sef/sefSmiley.htm
https://www.cs.cmu.edu/~sef/