Yuji Naka, the father of Console Homebrew?
I did some research lately and apparently Yuji Naka created the very first NES emulator on a console. The console in question was the Sega Mega Drive/Genesis! However he could not release it for obvious reason but it made him a respected member of Sega and AM8.
"There were a few other projects from this period, including the Mega Drive version of Ghouls 'N Ghosts. In his spare time between games, Naka tinkered with ways to play NES games on the Mega Drive, an effort the eventually resulted in the first video game system emulator. Releasing such a device would have proven impossible at the time, but his efforts gained him the respect and admiration of his fellow AM8 team members, due to the complexity and innovation such an undertaking required."
http://www.sega-16.com/Sega%20Stars-%20Yuji%20Naka.php
DiGG THIS