Apollo M. Nkwake works as International Technical Advisor on Monitoring, Evaluation and Learning. He previously worked as Associate Research Professor for monitoring and evaluation at The George Washington and Tulane Universities. He has worked for international agencies across Africa, Asia, and Latin America. Apollo holds a PhD from University of Cape Town and is designated as Credentialed Evaluator by Canadian Evaluation Society. Dr. Nkwake is a recipient of American Evaluation Association’s 2017 Marcia Guttentag Promising New Evaluator Award. He has authored three other books, several journal papers/book chapters and has guest edited two special journal volumes. He is the author of Credibility, Validity, and Assumptions in Program Evaluation Methodology (2015, Springer), and Working with Assumptions in International Development Program Evaluation (2013, Springer); His edited journal volumes include Working with assumptions: Existing and emerging approachesfor improved program design, monitoring and evaluation (Evaluation and Program Planning Journal) and Catalyzing and measuring women’s leadership and empowerment in African agricultural research and development (Journal Gender, Agriculture and Food Security).