"Holds a Bachelor of Laws Degree from the University of Dar es Salaam, Tanzania and is an Advocate of the High Court of Kenya, an Albert Parvin Fellow of Princeton University as well as a Fellow of the Kenya Institute of Bankers (FKIB). He is currently the Executive Director incharge of Legal and Corporate Affairs at Industrial Promotion Services Group of Companies. He joined the board in December 1995. Mr. Okello is the Chairman of Barclays Bank of Kenya Limited and TPS Eastern Africa Limited (Serena Group of hotels and lodges). Mr Okello is the Chairman of the Editorial Committee." 
He "is Chairman of Barclays Bank of Kenya Limited, Tourism Promotion Services Limited (Serena Group of Hotels & Lodges) and a Non Executive Director, Nation Media Group Limited, among others. He is currently the Head of Legal and Corporate Affairs, Industrial Promotion Services Group of Companies (IPS) operating in East Africa. IPS is an affiliate of the Aga Khan Fund for Economic Development (AKFED). He is a former Executive Director of Diamond Trust Bank Kenya Limited, and Chairman of The Kenya Institute of Bankers."  (from 2006)
Resources and articles
- Directors, Nation Media Group, accessed June 15, 2010.
- THE ROLE OF BANKERS IN PROMOTING COMPLIANCE WITH ENVIRONMENTAL LAW, accessed June 15, 2010.