Douglas Melton, co-director of HSCI, is the Xander University Professor at Harvard and an Investigator of the Howard Hughes Medical Institute. He earned a bachelor's degree in biology from the University of Illinois and then went to Cambridge University in England as a Marshall Scholar. He earned a BA in history and philosophy of science at Cambridge and remained there to earn a PhD in molecular biology at Trinity College and the MRC Laboratory of Molecular Biology.

Doug Melton's goal is to cure diabetes. His lab is working to eliminate the present practice of regular blood checks and insulin injections, replacing them with insulin-producing cell transplants, specifically pancreatic beta cells that measure glucose levels and secrete just the right amount of insulin.

The Melton lab applies developmental biology to understand and change the course of diabetes. The methods they have developed to make hundreds of millions of functional beta cells from human stem cells (ES or iPS cells) form the central theme for their research.