Dr. Hodon Ryu received his doctoral degree in the Department of Civil and Environmental Engineering at Arizona State University (ASU), USA in 2003. He has been working in US EPA since 2009 as an NRC senior fellow and a federal employee. Before joining EPA, he worked in the NSF Water Quality Center at ASU as a research faculty member. Dr. Ryu is currently an Environmental Engineer/Microbiologist in US EPA. His main research interests lie in health-related environmental microbiology and biotechnology. Briefly, these include the following: (1) water treatment processes for the removal of microbial contaminants, (2) pathogen detection and quantitative microbial risk assessment, (3) microbial community characterization and bioinformatics, and (4) sustainable energy-saving wastewater treatment systems.