Yuval Dor is a professor in the Faculty of Medicine at The Hebrew University of Jerusalem. His research focuses on the basic problem of organ size control and its implications on human health and disease: how is the proper size of organs determined and maintained? What are the cellular origins of tissues? What are the molecular signals that control tissue mass homeostasis and regeneration? These problems are studied in the context of the developing and adult pancreas, aiming to obtain insights of relevance for diabetes and pancreatic cancer. Most of Prof. Dor's group's work focuses on the biology of insulin-producing beta cells. They wish to understand how beta cells are generated during embryonic development and in postnatal life, what controls beta cell mass in healthy and disease conditions and the mechanisms of beta cell failure in diabetes.