Smeags on 24 September 2008
EAD Software Group Tokyo
(Responsible for titles such as Super Mario Galaxy and Donkey Kong Jungle Beat)
EAD Software Group 3
(Responsible for titles such as Ocarina of Time and Wind Waker)
Retro Studios
(Responsible for the Metroid Prime series)
Class Acts all around. 
*If you would have asked this question 15 years ago Sonic Team would definitely be up there. Oh how times have changed. 
