Mr. Hawthorne is a Principal and Vice President with GEI Consultants, Inc., the founder of Applied NAPL Science Review, and an active contributor to ITRC, ASTM and other NAPL related guidance document teams. He has spent 29 years characterizing and remediating NAPL releases across the United States in various hydrogeologic environments at refining, pipeline, gas plant, terminal, UST, and other industrial and transportation related sites. He is the lead author on API's national LNAPL transmissivity study and the author of multiple NAPL transmissivity articles and conference presentations.