Alexandra M. Dumitrescu, MD, PhD, is an endocrinologist who specializes in the diagnosis and treatment of thyroid diseases. Dr. Dumitrescu's research focuses on identifying inherited genetic mutations that may cause thyroid diseases. She has worked closely with Dr. Refetoff, MD, a world-renowned expert in genetic diseases of the thyroid. An accomplished author, Dr. Dumitrescu has contributed to several leading textbooks on thyroid diseases and frequently is invited to present her work at national and international conferences. She is an ad hoc reviewer for several scientific journals and serves on the editorial board of the Journal of Molecular Endocrinology of the European Society of Endocrinology.