He is a graduate of Takushoku University and attended the JKA instructor's classes at the JKA honbu dojo in Tokyo.
He began to feature in high level races while attending Takushoku University and ran at the 2005 Hakone Ekiden.
He enrolled at the Bogor Agricultural University for 3 terms, until he received a scholarship and moved to Waseda University, Japan, where he earned the title Bachelor of Engineering and then the title Master of Engineering from Takushoku University and PhD from Graduate School of Science Knowledge, Japan Advanced Institute of Science and Technology (JAIST).
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Ikuhiko Hata, a historian at Takushoku University and one of Yoshida's leading critics, pointed to inconsistencies between Yoshida's 1977 and 1983 memoirs, using these to assert that his claims are fabricated.