Dr. YuJung Chang
Dr. Chang is HDR’s National Director of Advanced Water Treatment and the Technical Director of Water Supply & Treatment Business Class.  He also directs HDR’s Applied Research & Technology Center and is responsible for the development, evaluation and implementation of advanced water treatment technologies to meet industry’s demand.  Dr. Chang has over 22 years of experience in water treatment with emphasis in adsorption, membrane separation, desalination, advanced oxidation, and UV disinfection processes.  He is a nationally recognized expert in advanced membrane technology.  The fusion of his broad knowledge in both chemistry and engineering empowers Dr. Chang in directing scientific research and developing leading-edge technology to serve each project’s special needs.  Dr. Chang invented several patented treatment processes for both potable water and industrial water treatment, including engineered sorptive media and the combined adsorption/ultrafiltration processes for the removal of soluble contaminants as well as membrane fouling mitigation.  Dr. Chang has undergraduate degrees in chemical engineering and agricultural engineering and received both of his Master and Doctoral degrees in Environmental Engineering from the University of Washington. Prior to joining HDR, Dr. Chang was an assistant professor at the West Virginia University, and he is currently an Adjunct Professor at the University of Washington.

Paulette Johnsey
Paulette Johnsey obtained a Bachelor of Science degree from Northwestern State University in Louisiana with an emphasis on microbiology.  While pursuing her degree, she worked in the medical field and University research.  After obtaining her degree, Ms. Johnsey worked for eleven years at Louisiana State University in the Plant Pathology and Physiology Department doing research in plant systems (biochemical, pathology, and physiology) and pursued additional post graduate work in ecology and biological systems.  In 1988, she went to work as a Scientist for the Environmental Protection Agency (EPA) focusing on implementation of the Clean Water Act.  In her eighteen years at EPA, she has been involved in scientific policy analysis and decision in all aspects of water chemistry and engineering.  She is currently Deputy Director of External Affairs overseeing Regional communication to the public and within government on a variety of environmental issues from solid and hazardous waste disposal to air pollution.  This latest work provides an even broader context to understand the environmental water issues shaping our world.

Dr. Ke Li (Luke)
Dr. Li is an assistant professor of research at Arizona State University. Dr. Li's research interests include the following: (1) the application and modeling of physical and chemical processes for the recovery, removal, or destruction of organic compounds from water and air streams; (2) complexity models for radical reaction systems, urban growth, and eco-environmental systems; (3) urban sustainability studies using a holistic system approach; and (4) advanced technologies for the treatment of emerging contaminants and control of disinfection byproducts. Dr. Li received his doctoral degree from Michigan Technological University in 2003 in Civil and Environmental Engineering.

Raymond R. Longoria, P.E., B.C.E.E.
Mr. Longoria, a principal of Freese and Nichols, has served as a design engineer, project engineer, and project manager for numerous wastewater treatment facilities and wastewater collection/conveyance systems in his 22 years of experience.  He is a Diplomat of the American Academy of Environmental Engineers.  Mr. Longoria's degrees are as follows: M.E. in Civil Engineering from Texas A&M University (1982); B.S. in Civil Engineering from Texas A&M University (1977).

Scott Stewart
Scott Stewart received his Bachelor of Science in Chemical Engineering from Oregon State University in 1982.  He has been employed by Intel Corporation since as a process engineer, corporate program manager, and most recently as a Senior Environmental Engineer with experience in all environmental media.  He has established excellent relationships with regulating agencies and successfully negotiated flexible permits in both wastewater and air.  He recently has been working on chemical substitution, process changes, and abatement technologies to reduce the environmental footprint of the typical semiconductor manufacturing facility. Scott has judged at the International Science & Engineering Fair (ISEF) and the U.S. Stockholm Junior Water Prize competition.  He has participated in a number of policy and regulatory development efforts with local and state agencies.  He is a member of the Clean Water Services Advisory Commission.  Scott is married with two children and is a fifth generation Oregonian.  His hobbies include sailing, bicycling, and of course, family.

Dr. Charles Wolf
Dr. Charles Wolf is a registered professional engineering in Arizona, and a Senior Associate with Malcolm Pirnie, Inc. in Phoenix, Arizona, where he serves as a project manager for large water and wastewater treatment capital projects, resource manager for the firm’s design resources in the State of Arizona, and as champion for one of the firm’s strategic initiatives.  He is also the Vice Mayor of the City of Avondale, Arizona, a city in the western portion of Maricopa County with approximately 70,000 residents, where he is involved in several community organizations and activities and chairs the City Council’s subcommittees for citizen boards and commissions selections and the City Council’s annual contributions assistance program.  Through both of these employment experiences, Dr. Wolf has developed a strong understanding of the effect of water, both in quantity and quality, on public policy, and in the opportunities that exist by improving the delivery of capital projects by public entities.  Dr. Wolf received his doctoral degree from Texas A&M University in 2001 in Civil Engineering.  This followed undergraduate and Master degrees from Texas A&M University in Civil/Environmental Engineering.  In 2003, he was selected as the “Young Engineer of the Year” by WEF’s Member Association in Arizona, the Arizona Water and Pollution Control Association.  He also served as chair for the Stockholm Junior Water Prize National Competition Local Arrangements Committee for the competition held in Arizona in June 2007.

Dr. John Woodward
Dr. John Woodward was born in the UK in 1946 and educated through the British Grammar School and University system.  He earned a Bachelor of Science in Plant Biology (1970) and a Ph. D. in Biochemistry (1975).  He completed Post Doctoral fellowships in State University of New York, Stony Brook (1975-78) and Cambridge University, England (1978-80).  Dr. Woodward then worked as a scientist in Unilever PLC on enzyme technology.  He was Senior Lecturer/Director of the Biotechnology Unit at Leeds University England in 1983-1990, where his research interests were biosensors, protein stabilization and protein structure and function.  In 1991, Dr. Woodward emigrated to the USA, where he was the YSI Inc. Head of Research in optical sensors, electrochemistry, and biosensors through 1997.  Since then, he has worked as Principal Scientist, Advanced Technology Unit, interests in electrochemistry and environmental monitoring at GLI (now part of Hach company).