Kanemaki Jisai and Sasaki Kojirō were both a what of respective fields of study?
Kanemaki Jisai Kanemaki Jisai (鐘巻 自斎 , c.1536 – 1615) was a master of the Chujō-ryū fighting style. He was a student of Toda Seigen and teacher to Itō Ittōsai (possibly also Sasaki Kojirō).
Yamada Kōrin Yamada Kōrin (山田 弘倫 , March 1869 – April 6, 1955) , whose first name is also glossed as Hirotomo, was a Japanese doctor involved in the promotion of hygiene and dermatology. He co-authored a popular handbook on cutaneous disease. Written with Keizo Dohi (土肥 慶蔵）and Asahi Kenkichi (旭 憲吉), "The Diagnosis and Treatment of Skin Disease" (皮膚病診断及治療法) was first published in 1901, and its chapters are organized according to pathology.