Hajime Isogai (磯貝 一, Isogai Hajime; October 26, 1871 – April 19, 1947) was an early student of judo and the second person to be promoted to 10th dan. He was considered to be a newaza expert, although was also famed by his tachiwaza as well. He was an early promoter of the kosen judo circuit.
Source: “Hajime Isogai”, English Wikipedia (CC BY-SA 4.0), excerpt