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Alexander is co-Chairman of the Brigham and Women's Hospital Education Committee on Teaching and Education,[4] and Director of the Brigham and Women's Hospital Principal Clinical Experience.[5]
Alexander is Chief of the Thyroid Section at Brigham and Women's Hospital.[6] He is co-Chairman of the 2017 American Thyroid Association national clinical guidelines on the treatment of Thyroid Disease during Pregnancy.[7] His work investigating thyroid physiology during pregnancy has helped to define treatment paradigms designed to prevent maternal hypothyroidism and its consequences.[8]