John Spencer is a Senior GIS Specialist at MEASURE Evaluation, a cooperative agreement at the Carolina Population Center at the University of North Carolina at Chapel Hill funded by USAID to strengthen capacity in developing countries to gather, interpret, and use data to improve health. He holds a Master’s degree in Geography and is a spatial analyst specializing in issues concerning health and medical geography. He has 20 years experience with spatial tools such as Geographic Information Systems (GIS), Global Positioning System (GPS) receivers and spatial analysis methods. Mr. Spencer has cultivated experience in the use of these tools to better understand the distribution of health services and their relationship to populations in need, as well as using GIS to strengthen the available data infrastructure through its ability to link disparate data sets. He has co-authored a book on the use of GPS receivers in social science research, as well as multiple guides and toolkits which facilitate the use of spatial methods and techniques in health research. Additionally, Mr. Spencer has written numerous articles on methods and techniques for understanding accessibility and potential accessibility to health services. He has taught multiple courses, workshops and trainings on the use of GIS, GPS and other spatial tools.