Steve Evett is a research soil scientist with the USDA Agricultural Research Service in semi-arid West Texas, where he conducts research on irrigation methods and management and on development of soil and plant water status sensors, wireless sensing systems and automated decision support systems. He has worked with irrigation management in the western United States and in several countries in Africa, the Middle East and Central Asia. His recent work has quantified reduction in evaporative losses when using SDI, development of crop coefficients for SDI in the Southern High Plains, and development of a decision support system for variable rate irrigation.