I'm mainly just doing this to replace an old review. He help created one of my favorite game franchises which is Sonic the Hedgehog and was involved in most of the good ones (series got worse when he left though). He has also been involved other games such as the cult classic NiGHTS into Dreams and Phantasy Star Online which are some of Sega's most memorable games in my opinion.
While he left Sega and is now developing games under his new company PROPE, he seems to be doing well and his new games seem to be showing promise so I think we can expect more good things to come.