Bangladesh … 1975. Hidden under a burlap bag by parental shame, three-year-old Rahima Banu lay severely ill. Yet there you were, able to diagnose her—the last person in the world known to suffer from naturally occurring major smallpox. The road to that moment had been long. It began when, inspired by the spirit of the Haystack Prayer Movement, you decided on a career in public health. That led eventually to becoming a principal organizer of the fifteen-year effort against smallpox, which became a triumph of science, management, and international political cooperation. To isolate the virus among people reluctant to admit to the illness, you trained and mobilized armies of local health workers who offered citizens rewards for identifying possible outbreaks, so that, for instance, ten thousand Bengali health workers could search twelve million households in ten days. Having slain the smallpox dragon, you went on to work with colleagues in more than forty countries to strengthen their capacity to assess health needs and to plan, implement, and evaluate programs to improve community health and wellbeing. Likewise you have worked to strengthen child-survival programs in more than a dozen African countries. At an age when you would be forgiven for retiring, you continue your work, as the Haystack participants would say, “into all the world”—work that recently took you back to Bangladesh and to a reunion with Rahima Banu, whose children—you couldn’t help yourself—you taught habits of good health. In recognition of your distinguished achievement in international public health, Williams College is proud to honor you with its Bicentennial Medal.