From the Super Mario Wiki
Toshiharu Izuno (伊豆野 敏晴) is a video game developer and producer at Nintendo. Izuno served as the chief of Nintendo SPD Group No. 4 along with Hiroshi Sato, and has produced several Mario games including the Mario Golf, Mario Tennis, DK, and Mario & Luigi series (since Bowser's Inside Story). He is currently the manager of Production Group No. 2 of Nintendo EPD.