Dr. Lewis Semprini's research focuses on biological processes for the treatment of hazardous wastes, and on the fate and transport of organic contaminants in the environment. He specializes in field, laboratory, and modeling studies of aerobic and anaerobic processes for treating chlorinated solvents. His research efforts aim at integrating the results of field, laboratory, and modeling studies in order to effectively apply the technology in the field. He also performs research using naturally occurring radon-222 as a subsurface tracer.