Alfonso Mejia is an associate professor of civil and environmental engineering at Penn State, whose research focuses on water and water resources. Mejia studies water from an engineering and resource management perspective, including hydrology and the physical processes that drive the hydrological cycle, and how those processes interact with communities and infrastructure. He also studies water as it relates to climate change and an increase in extreme weather events such as flooding and drought. Recent research highlights include developing a framework for better assessing flood risk and developing a risk model linking supply chain diversity to the probability of a city experiencing food shocks.