Chemical toxicology of solvents, pesticides herbicides, metals, hazardouswastes, regulatory affairs, occupational health, indoor air quality, industrial hygiene, toxicological data interpretation, risk assessment hazard identification, exposure assessment, chemical fate and transport, health and safety, forensic toxicology, risk characterization, expert witness, state and federal courts.

Former Professor at Texas A&M University, Louisiana Tech University and visiting professor at University of Texas Medical School in Houston, Texas. Former researcher at Baylor Hospital in Dallas, Texas. Former owner and founder of three environmental firms in Texas, Arkansas and Louisiana.