This book was written to inform the educated public about the potential hazards of neurotoxic substances. The impetus for this book was a telephone call in June, 1988, from Mr. Robert Esposito of Van Nostrand Reinhold. He wanted to know if I would be willing to write a book on neurotoxicity that would be suitable for industrial hygienists, safety professionals, occupational health personnel, and others interested in neurotoxicity, including psychologists, neuropsychologists, physicians, risk analyzers, and government regulators.