Zachary earned his PhD from the Energy and Resources Group at the University of California, Berkeley. He then completed his postdoctorate at Columbia University and a Fulbright Fellowship at the Indian Institute of Technology – Bombay. His research has focused on access, equity and affordability in water and sanitation systems. This incorporated considerations of climate adaptation, sustainability and public health. He uses mixed-methods in his research, blending quasi-experimental methods for impact evaluation with standardized surveys, semi-structured interviews and participant observations. He also uses discrete-choice models to estimate preferences and willingness-to-pay. Integrating these with cost-of-service models, cost-effectiveness and cost-benefit analyses, he is able to assess optimal allocations of private and public resources for essential services. Zachary has conducted field research in India, Tanzania, Kenya, and Morocco, and assessed urban water policies in California, India and Kenya. His list of research publications are available on LinkedIn.