After returning to the States, he continued to study under Bong Yul Shin, Sung Jae Park and Soo Hwang. In 1960, he opened Paja Dojo in New York. Soon after, he met Grandmaster Hara Naraki and started training in Nippon Goshindo Kenpo and Hakko Ryu, later receiving a 3rd Dan under Grandmaster Hara. He was also part of Grandmaster Hara's demo team at the Japanese Pavilion at the 1964 Worlds Fair alongside such famous practitioners as Michael DePasquale, Sr., Ronald Duncan and Moses Powell.
Regardless of his other training, Judo remained at the core of what Stern taught and pursued. During his lifetime, he was a member of the Armed Forces Judo Association (which later became the USJA), Judo Black Belt Federation of America (which later became the USJF), New York Judo Yudanshakai, Korean Yudo Association, Shufu Judo Yudanshakai and the Kodokan in Japan.
As stated above, Kojido was inherited by Dell Sharpe upon Stern's passing in 2012. However, Hatfield sensei was Stern's highest ranking student in Yudo and therefore the art went to him. Therefore, through the Seikan students have the opportunity to study either Kontei Kodokan Judo, which is the complete curriculum of Kano's Judo including kata, striking, throwing and grappling, or the Korean version based on the Gokyo no Waza, and earn rank in both.
In a previous article, I listed three distinct Judo styles that have developed in Japan alone:
- Kodokan Judo - The complete art encompassing atemi waza, nage waza and katame waza
- Kosen Judo - Judo training focusing on an expanded ne waza curriculum
- Olympic Judo - Modern sport focusing solely on nage waza