Around 1950, Jiro Ōtsuka (the founder's second son) began training in Wadō-ryū while in his adolescent years. In 1951, Ōtsuka awarded Tatsuo Suzuki the rank of 5th "dan", the highest rank awarded in Wadō-ryū at that time. In 1952, the Wadō-ryū headquarters ("honbu") was established at the Meiji University dojo in Tokyo. In 1954, its name was changed to "Zen Nippon Karate Renmei" (All Japan Karate Federation). In 1955, Ōtsuka published "Karatejutsu no Kenkyu," a book expounding his style of karate. In 1963, he dispatched Suzuki, along with Toru Arakawa and Hajimu Takashima, to spread Wadō-ryū around the world.