Dr. Thrasher received a Bachelor's of Science degree in 1959 from California State University, Long Beach, and a Ph.D. from the University of California, Los Angeles (UCLA), School of Medicine, Department of Anatomy in 1964. He taught medical students at both the University of Colorado and UCLA in cell biology, human anatomy, physiology and embryology.
Dr. Thrasher has specialized in Toxicology since 1966 and Immunotoxicology since 1986. He has been a consultant to toxicology laboratories and three human diagnostic laboratories. He has been an expert witness in government, defense and plaintiff cases.
Dr. Thrasher has published peer-reviewed research papers on the toxic effects of various chemicals, bacteria, molds and mycotoxins on animals and humans. These include the immunotoxicology of formaldehyde, organophosphate insecticides, chlorinated insecticides, solvents, isocyanates hydrogen sulfide, and molds and bacteria in water-damaged homes and buildings.