From the Super Mario Wiki
Yoshiaki Koizumi (in Japanese: 小泉 歓晃; born April 29, 1968) is the director of Super Mario Sunshine, Donkey Kong Jungle Beat and Super Mario Galaxy. He also worked on significant contributions to other major Mario games, such as Super Mario Kart, Super Mario World 2: Yoshi's Island, and Super Mario 64, but under different roles.
Yoshiaki Koizumi plays an important role during E3 2019's Nintendo Direct presentation, announcing Bowser as the new president of Nintendo's North American branch. Bowser, King of the Koopas, appears onscreen, proud to hear his name. Yoshiaki Kozumi says the Koopa King is the wrong "Bowser", as Doug Bowser walks onscreen, much to the former Bowser's shock and confusion.
Nintendo Power interview
Nintendo Power interviewed Yoshiaki in a special section mainly for Super Mario Galaxy. In the interview, he revealed the following facts about the development of the game:
List of works