Castro, M. Regina: - M. Regina Castro, M.D., is an endocrinologist at Mayo Clinic in Rochester, Minn., and a Professor of Medicine at Mayo Clinic College of Medicine and Science. Dr. Castro's work combines seeing patients, educating residents and fellows, and doing clinical research. She is the Director of the Endocrinology Fellowship Program at Mayo Clinic. Within the practice, her primary interests are in evaluating and treating patients living with diabetes and thyroid disorders. Her research interests include the use of technology and data to improve diabetes care, with an emphasis on machine learning algorithms.