Mr Akinsanya is a first-degree Economics graduate of the University of Lagos and a Masters of Business Administration degree holder from Ahmadu Bello University, Zaria, where he graduated at the top of his class in 1979. He joined the accounting firm of Arthur Andersen & Co. as a trainee accountant and qualified as a Chartered Accountant. He is an Associate and Merit Award Winner (1983) of the Institute of Chartered Accountants of Nigeria. He is also an Associate of the Chartered Institute of Stockbrokers of Nigeria and a licensed dealer on the Nigerian Stock Exchange.
He began a career in merchant and investment banking with First City Merchant Bank in 1985 and left as General Manager and Head of Corporate Finance in 1993. He was also a Director of City Securities Limited and represented CSL Stockbrokers Limited on the National Council of the Nigerian Stock Exchange between 1985 and 1988. He is one of the founders of the Nigerian Economic Summit Group and was actively involved in designing the processes that modernized the securities market and established the investment banking profession in Nigeria.