Born in Tokyo. In 2006, he relocated to Mashiko, Tochigi Prefecture, where he worked at a pottery. He established his own kiln in Ōsawa, Mashiko in 2013, and in 2018 founded Negishi Seitō. This small pottery studio is run by a husband-and-wife team. Their work is characterized by nuanced colors produced by glazes uniquely blended from a base of natural wood ash, applied to clay from Mashiko. They create simple, everyday vessels with a soft texture and expressive glaze surfaces that blend seamlessly into daily life.