Paul Hatzinger is a senior scientist at the Princeton Research Center of Shaw Environmental in Lawrenceville, NJ. He joined Shaw in 2003 after working as a research scientist at Envirogen for 6 years. Paul’s current areas of research focus on the development of in situ and ex situ bioremediation technologies for emerging contaminants and the use of isotopic methods to distinguish contaminant sources. He has been performing research on perchlorate biodegradation and bioremediation since 1999. Paul has served at the Principal Investigator on several research projects focused on perchlorate treatment, including three field demonstrations of in situ remedial approaches, and projects evaluating the use of stable isotopes to delineate natural from anthropogenic perchlorate in the environment. In addition, Paul works closely with the engineering group at Shaw that has designed and constructed 5 full-scale bioreactor systems for treatment of perchlorate in groundwater. He has authored more than 40 peer-reviewed research papers and book chapters, including several on perchlorate treatment and forensics. Paul has been a member of the ITRC Perchlorate team since inception. He earned a bachelor's degree in Biology and Environmental Science from St. Lawrence University in Canton, NY in 1986, and he holds both a master's degree (1991) and a doctoral degree (1996) in Environmental Toxicology from Cornell University in Ithaca, New York.