Ogbonnaya graduated from Institute of Management and Technology, Enugu with HND (Distinction) in Accounting. He also holds B.SC in Banking & Finance from Olabisi Onabanjo University, Ago-Iwoye and MBA (Financial Management) from Lagos State University. Mr. Onu began his working career at Ernest & Young (Chartered Accountant), where he rose to the post of Audit Senior. He was involved in auditing, management and tax consulting for high profile clients. He later joined Zenith Bank Plc and worked in various areas in the bank including Business Development, Branch Management and as Head of Operations of key branches.

He distinguished himself in each assignment. An avid reader and prolific writer, Mr. Onu has attended different courses on management development and financial management. He is also an Associate Member of Institute of Chartered Accountants of Nigeria (ICAN). Mr. Onu was the Chief Operating Officer of Olive Microfinance Bank Limited, from where he joined Masters Energy Oil & Gas Ltd. as Group Finance Controller. He later moved to become the Group Auditor until his recent position as the Executive Director in charge of Other Non-Financials Subsidiaries.