神奈川大学
Keiji Ozaki was born on April 24, 1980 in the prefecture of Kanagawa, Japan. He spent his young age in United States, in Murrysville, PA until he was halfway through high school. After coming to a Japanese high school, he started practicing finswimming. He participated in the Japanese national championship of swimming for 5 different disciplines in 1999, and he won 5 gold medals at 5 disciplines. After graduation of high school, he entered Kanagawa University and he joined its taekwondo team.