Dr. Susan Bonner-Weir is Senior Investigator, Joslin Diabetes Center and Professor of Medicine, Harvard Medical School. She graduated from Rice University and received her PhD in biology from Case Western Reserve University. For over twenty-five years she has focused on the endocrine pancreas (the islets of Langerhans) in three areas: 1) the architecture of the islet and its implications for function; 2) the in vivo regulation of beta-cell mass; and 3) the factors involved in islet growth and differentiation. Her focus now is how to make a reliable source of new beta-cells. She has published over 180 peer reviewed papers, and numerous chapters and reviews. Dr. Bonner-Weir has served on research grant review panels for the NIH, American Diabetes Association, Juvenile Diabetes Research Foundation, the Danish National Research Council, the European Research Council, and the California Institute of Regenerative Medicine and on the editorial boards of Endocrinology, American Journal of Physiology, Diabetes, Diabetes Technology and Therapeutics, Cell Transplantation, and Journal of Biological Chemistry.