Ernest R. Blatchley III, PhD, is the Lee A. Rieth Professor in Environmental Engineering at Purdue University, where he holds a joint faculty position in the Lyles School of Civil Engineering and the Division of Environmental & Ecological Engineering. He received his doctorate in Civil (Environmental) Engineering from the University of California, Berkeley. The behavior of photochemical reactors has been a central focus of his research, involving fundamental principles of photochemical reactor theory, the development of diagnostic and analytical methods, and improvements of reactor performance in practical applications.