Draft April 7, 1981 Ms. Susan E. Garfield Coordinator Bellagio Study & Conf. Center The Rockefeller Foundation 1133 Avenue of the Americas New York, New York 10036 Dear Ms. Garfield: I was very glad to hear that you may have an opportunity to accommodate Dr. Isac Halbrecht for a residency at your center in Bellagio. I have known Dr. Halbrecht for many years and am delighted to note that his advancing age has been no barrier to his continued productive activity well past normal retirement. He has played a very important role in building the foundations of human population genetics, especially in Israel, and as concerns the genetic history of Jewish people scattered in communities throughout the world. In previous years he was very important in bringing advances in genetics into pediatric research and training ata very high level of competence. I am happy indeed to endorse his request and believe that you can do no wrong in complying with it. Ys, JL