Duncan is a Senior Lecturer at the Faculty of Business and Management Sciences, University of Nairobi. Duncan holds and has research expertise and interests in entrepreneurial, development, personal, and corporate finance. Duncan served in the Kenyan banking industry as an SME relationship manager and credit analyst with roles in relationship creation, portfolio development and portfolio monitoring. He has served as a member of the Institute of Certified Investments and Financial Analysts (ICIFA) council, where he chaired the Education and Research Committee, and as a director of the ICIFA college. He is currently a member of the institute's Disciplinary Committee. Duncan founded the Entrepreneurship Educators Foundation for Eastern Africa (EEFEA), an entrepreneurship ecosystem support player in the East Africa region that spearheads the Youth Entrepreneurship Accelerator Platform (YEAP). Duncan is also the founder and Editor in chief of the African Development Finance Journal (ADFJ) and the African Journal of Entrepreneurship and Innovation (AjeIN). He is also the founder and coordinator of the Annual Development Finance Conference (ADFC).