He learned Dutch medicine in Nagasaki in his youth. He further studied under two Dutch physicians, Feillke and Bateij. Also studied Confucian classics and became a well-known scholar.
He was a chief of the Dutch Commercial House in Nagasaki, employed him as physician attached to the Dutch establishment. He stayed in Nagasaki 14 years before he began practicing in Kyoto, where he won great fame. He maintained the Junsei-Shoin, a library, in the compound of the Nanzenji Temple and gave lectures free of charge.