Dr. Eduardo Gaitan, is Professor of Medicine, University of Mississipi Medical School and Chief, Endocrinology Section at the Jackson VA Medical Center, Jackson, Mississipi, USA. He graduated MD "Summa Cum Laude" in 1954, and his Specialty is Endocrinology and Internal Medicine. He has been Chairman of the Public Health Committee of the American Thyroid Association, Member of the Executive and Central Committees of the International Endocrine Society, Member of the Editorial Board of Risk Analysis, Member of the Medical Advisory Council of the Thyroid Foundation of America, President of the Latin American Thyroid Society and President of the Colombian Endocrine Society. He is Senior Advisor to the International Council for Control of Iodine Deficiency Disorders (ICCIDD), and until recently, Research Program Specialist for Environmental Agents of the Department of Veterans Affairs. He was honored with Direct Election to Fellowship in the American College of Physicians (1990) and Exceptional Qualifications by the Department ov Veterans Affairs (1993). Dr. Gaitan has worked and published extensively in the area of Goitrogens and other Environmental and Host Factors in Thyroid Disorders. He is Editor of two (2) books on Thyroidology and Environmental Goitrogenesis, and he received the International Ache Prize Award of the Latin American Thyroid Society (1985), the Distinguished Alumnus Award (1988) and the Excellence Award in Medicine by the Alumni Association of the National University of Colombia (1989), the National Prize of Science of Colombia (1976), the First Colombian Scientific Prize in Medicine (1972) and Corresponding Membership in the European Thyroid Association (since 1973) in recognition of his important contributions in neurohypophyseal and thyroid research.