Gayle Hagler is an environmental engineer in the U.S. Environmental Protection Agency Office of Research and Development. Dr. Hagler received a B.S. and M.S. degree in Civil Engineering, as well as a Ph.D. in Environmental Engineering from the Georgia Institute of Technology. Dr. Hagler’s research focuses on ambient air quality and source emissions, and she has conducted field studies at a number of cities in the United States, the Pearl River Delta Region of China, and the Greenland Ice Sheet. Dr. Hagler has authored or coauthored over 20 science journal articles as well as contributing to EPA’s Report to Congress on Black Carbon. She has received several awards based on her research accomplishments, including the Presidential Early Career Award in Science and Engineering (PECASE).