Daniel Thau Teitelbaum, M.D. is Adjunct Professor of Occupational and Environmental Health at the Colorado School of Public Health. He is also Adjunct Professor of Environmental Sciences at the Colorado School of Mines. Board Certified in Preventive Medicine/Occupational Medicine, and in Medical Toxicology by the original American Board of Medical Toxicology, he has practiced as an occupational toxicologist for more than forty years in Denver. His activities in the specialty of toxicology have included laboratory medicine, clinical toxicology, occupational hygiene and forensic toxicology. He has frequently consulted for United States Occupational Safety and Health Administration, and participated in the development of many of the current OSHA Standards including the Hazard Communication Standard, The Lead Standard, The Benzene Standard and others. He has also consulted for the United States Environmental Protection Agency, and for the State of Colorado. He has been Visiting Professor of Medicine at the Technion, Israel Institute of Technology, School of Medicine in Haifa, Israel. He also served as Director of the Israel National Poison Information Center. He has published some fifty papers in the field of toxicology over the course of his career. He is an avid photographer, printmaker and photography collector.