Mr. Mainnah holds a Bachelor of Commerce (Accounting) from the University of Nairobi and is an alumnus of INSEAD, France, with training in Risk Management in Banking. He retired in 2012 as Group Head of Enterprise Risk at CBA after 38 years of service. With deep expertise in business management, credit, and risk, he currently offers consultancy in strategic leadership and risk management. He also serves on various educational boards and provides financial leadership to charitable organizations.