Kawaishi is credited with being the person most responsible for the spread of Judo and Jujitsu throughout France and much of Europe. His books continue to be popular, and the Kawaishi Method is still practiced around the world today, mostly under the banner of Kawaishi Jujitsu since his judo did not constitute a split from kodokan judo but rather something more than the sport of judo. Kawaishi and Moshe Feldenkrais founded the French Judo Federation and he served as Technical Director for many years. In 1947 he and Koizumi held the first ever international Judo tournament between France and the United Kingdom which became known as the Kawaishi Cup.
Kawaishi on far right pictured with Kano