Meet The Team
Board of Directors
Amb. Sarah Serem
Mr. Raphael Mingisian Lekolool
Mr. Henry Mutwiri Riungu
CHAIRPERSON
Amb. Sarah Serem
Amb. Sarah Serem is the current Chairperson of Postbank. She is a seasoned professional with over 35 years of experience in the public sector. Prior to her current role, she held the positions of ambassador of Kenya to China and Chairperson of the Salaries and Remuneration Commission. Amb. Serem holds a bachelor’s degree in Sociology and Political Science from the University of Nairobi, and has extensive expertise in Human Resource Management, leadership, and management.
MANAGING DIRECTOR
Mr. Raphael Mingisian Lekolool
Mr. Raphael Mingisian Lekolool (FCCA, CPA) holds a Master’s degree in Business Administration (MBA) from Cardiff Business School, U.K., a Bachelor of Science degree in Financial Services (Hons) from the University of Manchester Institute of Science and Technology (UMIST) and a Bachelor of Arts (Hons.) degree from the University of Nairobi. Raphael qualified as an Associate of the Chartered Institute of Bankers (ACIB), the U.K. in 2001 and is a Fellow of the Chartered Certified Accountants (ACCA) and a member of ICPAK.
Raphael served as a member of the ACCA (Kenya) Members committee and the Senior Members Advisory Committee. He has also served as the Chair of the Nairobi Chapel Finance Committee for six years. In a career spanning more than two decades in Banking and Insurance. Raphael has gained vast management and leadership experience. He has served in different capacities both in private and public service. Prior to assuming the role of Managing Director at Postbank, he was the Chairperson of the Risk and Audit Committee at the Ethics & Anti-Corruption Commission. He has also served as the Chair of the Interim Management Committee (Board) at the Agriculture Food Authority (AFA) between 2016 and 2017.
At the UAP-Old Mutual Group, Raphael worked as the Enterprise Risk Officer tasked with the key responsibilities of formulation, review and implementation of the Group Risk Strategy programs for businesses in the region. His appointment at the Group preceded his serving at Faulu Microfinance Bank Ltd. where he worked in various capacities and led various teams as the Head of Risk and Compliance, Credit and Internal Audit and served as a member of the Executive Committee (EXCO) whose primary mandate is to oversee implementation of strategy and sustainable business growth. In these capacities, Raphael served as a secretary to various Board Committees.
Raphael has also served as the Head of Quality Assurance Audit at KCB Bank (K) Ltd. and was instrumental in implementing a Risk-based audit methodology in response to the bank’s rapid growth arising from the adoption of technology.
DIRECTOR
Mr. Henry Mutwiri Riungu
Mr. Henry Mutwiri Riungu is a financial professional with over fifteen years of experience. Top on the list of his vast experience is a fourteen-year tenure at the National Treasury in various capacities as Senior Finance Officer, Deputy Head of the World Bank Division and the most recent roles being Chief Investment Officer and Chief Intergovernmental Fiscal Relations Officer. During his tenure at the National Treasury, he was instrumental in ensuring that the resource mobilization function was performed by the Ministry of Finance for the benefit of Kenyans, specifically by reviewing financing and credit agreements for mobilisation grants and donations; facilitating and monitoring the implementation of donor-funded projects and undertaking research on external resources mobilization to inform policy development. Prior to joining the National Treasury, Mr. Mutwiri served as a Prices and Monopolies Officer at the Ministry of Finance, a Procurement Officer at the Office of the President and a Lecturer at Nyeri Technical Training Institute. He currently serves as a Board Member at Postbank. Mr. Mutwiri holds an MBA in Finance from Maseno University, a Post Graduate Diploma in Finance from KCA University and a Bachelor of Commerce degree from the University of Nairobi.
Senior Management
Mr. Raphael Mingisian Lekolool
Mr. Isaac Mumina Mutua
Dr. CPA Calistus Wekesa (PhD)
MANAGING DIRECTOR
Mr. Raphael Mingisian Lekolool
Mr. Raphael Mingisian Lekolool (FCCA, CPA) holds a Master’s degree in Business Administration (MBA) from Cardiff Business School, U.K., a Bachelor of Science degree in Financial Services (Hons) from the University of Manchester Institute of Science and Technology (UMIST) and a Bachelor of Arts (Hons.) degree from the University of Nairobi. Raphael qualified as an Associate of the Chartered Institute of Bankers (ACIB), the U.K. in 2001 and is a Fellow of the Chartered Certified Accountants (ACCA) and a member of ICPAK.
Raphael served as a member of the ACCA (Kenya) Members committee and the Senior Members Advisory Committee. He has also served as the Chair of the Nairobi Chapel Finance Committee for six years. In a career spanning more than two decades in Banking and Insurance. Raphael has gained vast management and leadership experience. He has served in different capacities both in private and public service. Prior to assuming the role of Managing Director at Postbank, he was the Chairperson of the Risk and Audit Committee at the Ethics & Anti-Corruption Commission. He has also served as the Chair of the Interim Management Committee (Board) at the Agriculture Food Authority (AFA) between 2016 and 2017.
At the UAP-Old Mutual Group, Raphael worked as the Enterprise Risk Officer tasked with the key responsibilities of formulation, review and implementation of the Group Risk Strategy programs for businesses in the region. His appointment at the Group preceded his serving at Faulu Microfinance Bank Ltd. where he worked in various capacities and led various teams as the Head of Risk and Compliance, Credit and Internal Audit and served as a member of the Executive Committee (EXCO) whose primary mandate is to oversee implementation of strategy and sustainable business growth. In these capacities, Raphael served as a secretary to various Board Committees.
Raphael has also served as the Head of Quality Assurance Audit at KCB Bank (K) Ltd. and was instrumental in implementing a Risk-based audit methodology in response to the bank’s rapid growth arising from the adoption of technology.
HEAD OF ICT & ALTERNATIVE CHANNELS
Mr. Isaac Mumina Mutua
Mr. Isaac Mutua is an experienced Technologist with over 20-year track record of managing and implementing innovative technical solutions in diverse industries. He holds a Bachelor of Science in Mathematics and Computer Science, Masters in Business Administration MIS/Strategic Management. He holds a number of ICT professional Certifications. He is a member of Kenya Institute of Management (KIM), Fellow of the Computer Society of Kenya (CSK) and sits in several Boards. Prior Experience includes EAPCC Kenya Ltd (Head of ICT), ICEALION Kenya Ltd (Group Head of ICT), Barclays Bank Kenya Ltd (Manager, Technical Support) and KIM (Lecturer, MIS and Management)
HEAD AUDIT
Dr. CPA Calistus Wekesa (PhD)
Dr. Calistus Wekesa is the Head of Audit at Postbank. In this role, he focuses on assurance on internal control and promoting good corporate governance.
Dr. Wekesa has over sixteen years experience, with particular emphasis on financial and revenue accounting, auditing, enterprise risk management, supply chain management, financial regulations, donor-funded project management, business strategies and human capital management.
Prior to his appointment, he served in several organizations amongst them Maseno University (Head Audit, Risk and Compliance) and Agro-Chemical and Food Company Ltd (Chief Audit, Risk and Compliance).
Dr. Wekesa has hands-on experience with ERP system (SAP), Navision Dynamics and TeamMade audit software. He holds PhD (Finance), MSc (Finance) and B.Ed (Accounting and Economics). He also holds a Diploma in HRM (KIM), Financial Risk Certification Programme (UK) and is a member of ICPAK. He sits on various audit committees among them The Bungoma County Assembly Audit & Risk Committee.
