Michaël Ryssen (Kokak)

Michaël Ryssen, alias Kokak, is a French software engineer, notably known for developing a wide array of various source ports, spanning the Doom, Hexen and Heretic games.

Contributions
In regards to Doom history, he has been responsible for the creation of the following source ports:
 * WinHeretic
 * WinHeretic Universal Save
 * WinHexen
 * GLHeretic
 * GLHexen
 * DoomGL
 * DoomPC
 * ZDoomGL (later transferred to Tim Stump (Timmie), who rewrote it entirely)
 * DoomGLES
 * DoomPPC

Other developments
Aside from Doom, Ryssen has worked on several games for and, and currently works at.