 Adesanya attended Ijebu Ode Grammar School, after which he worked as a teacher prior to travelling to the United Kingdom to study law at the then Holborn College of Law, Greys Inn.In 1959, Adesanya returned to Nigeria as a qualified lawyer and joined the Action Group led by Obafemi Awolowo.The same year, he was nominated and eventually elected to the Western House of Assembly to represent Ijebu Igbo constituency in the 12 December 1959 House of Representatives Election.