Hirokazu Yasuhara

Hirokazu Yasuhara (安原 広和), also known as Carol Yas, is a Japanese video game developer and game design professor, formerly game and level designer for Sega. He is better known as a co-creator of the Sonic the Hedgehog series, as well as chief map and game designer for the early Sonic the Hedgehog games all the way through Sonic Rin 1997, and the shelved Sonic X-treme.