He was appointed to the Board of Trustees in October 2022 as a sponsor nominated trustee. He is a member of the Administration & Communication Committee and a member of Investment & Strategy Committee.

He holds a Bachelor of Laws (LL.B) and Master of Laws (LLM) in Public Finance & Financial Services Law from the University of Nairobi, Master of the Science of Law (JSM) from Stanford University Law School, California, USA. Mr. Ouko holds a Diploma in Law from the Kenya School of Law, Practice Diploma in International Commercial Law from the College of Law of England & Wales, Postgraduate Diploma in Domestic Arbitration from the Chartered Institute of Arbitrators, Advanced Diploma in Business Administration and a Diploma in Management of Information Systems. He is an Advocate of the High Court of Kenya, Commissioner for Oaths, Notary Public, registered Certified Public Secretary, Fellow of the Institute of Certified Secretaries Kenya, Fellow of the Chartered Institute of Arbitrators (UK & Kenya Branch), an Accredited Governance Auditor, member of the Law Society of Kenya, the International Bar Association, the Commonwealth Lawyers Association and the Kenya Institute of Management. He is currently the Company Secretary and General Manager Legal Affairs at KenGen PLC and prior to joining KenGen, he was the Ag. General Manager-Corporate Affairs/Corporation Secretary since December 2013. He was previously, the Legal Manager at National Social Security Fund and Senior Legal Officer at the Standard Group Limited.