He also began studying Shorinji Kempo and several styles of karate including wado ryu, and shito-ryu.
Following his childhood dream he went to the United States and began teaching judo at West Point Military Academy.
He was also the founding coach of the Judo program at New Jersey Institute of Technology (then known as Newark College of Engineering) during the mid-60s.
Yonezuka believed that the Japanese could not accept that Judo became more like wrestling and less of a martial art.
Additionally he appeared on the cover of the United States Judo Federation Magazine along with Allen Coage in 1977.