Joan's teacher, Jakusui INOU, was a forerunner in the field of Japanese herbalism who transformed Chinese herbalism into the study suitable for Japanese environment; he instructed scholars who would further develop herbalism in the future.
師の稲生若水は中国の本草学を日本の本草学に変えていく草分けとして以後の本草学を発展させる人材を輩出した。