This issue of the Cambridge Quarterly is dedicated to the memory of Jonathan Mann. He was an inspired leader in the global struggle against AIDS and a creative intelligence envisioning the integration of the goals of medicine, public health, and human rights. In a memorable keynote address to the Third World Congress of Bioethics held in San Francisco in 1996, he challenged this community to bring its expertise to contribute to a broader, more social, and more global conception of healthcare than is common to our thinking. Jonathan's tragic death in the crash of Swissair Flight 111 in September 1998 took from us a beacon of insight and an active collaborator in this exciting prospect. His vision of justice and of the essential integration of the sciences of humanity has inspired this collection of essays.

We offer it to his memory in gratitude and admiration.