Shinya Yamaguchi is a renowned tea producer from Hoshino Village in Yame, Fukuoka Prefecture, celebrated for crafting some of Japan’s finest Sencha, Gyokuro and Matcha. A third-generation tea maker and the youngest person ever to achieve the prestigious 10-dan Tea Master certification, Yamaguchi-san balances deep tradition with a relentless drive for innovation in cultivar development and processing. Working in the remote, mist-covered mountains of Hoshinomura, he crafts teas of exceptional depth, sweetness, and clarity—among the most sought-after in Japan and deeply cherished by Kettl customers.