Hirokazu Yasuhara worked at Sega during the companys prime and he did gameplay and stages for the 4 of the genesis Sonic games. (the best ones)
http://en.wikipedia.org/wiki/Hirokazu_Yasuhara
While at Sega he worked with Mark Cerny on Sonic 2 and few other games before Mark moved on to Naughty Dog where he worked on Jack and Dexter, Crash Bandicoot and Insomniacs Ratchet and Clank.
http://en.wikipedia.org/wiki/Mark_Cerny
In 2001 Hirokazu Yasuhara and joined Naughty Dog as well where he worked and still works on Jack and Dexter series with his buddy Mark Cerny again.
The more you know...







