Yuji Naka (中 裕司, Naka Yūji, born September 17, 1965), credited in some games as YU2, is a Japanese former video game programmer, designer and producer. He is the co-creator of the Sonic the Hedgehog series and was the president of Sonic Team at Sega until his departure in 2006. Naka joined Sega in 1984 and worked on games including Girl's Garden (1985) and Phantasy Star II (1989). He was the lead programmer of the original Sonic games on the Mega Drive in the early 1990s, which greatly increased Sega's market share.
https://en.wikipedia.org/wiki/Yuji_Naka