It was a characteristically cold, bright morning in Geneva in 1986, and I had just taken the Number 8 bus from the Cornavin to the headquarters of the World Health Organization (WHO). I wandered into a cluttered and cramped office filled with unopened boxes and scattered papers. Jonathan Mann and a competent Swiss secretary, Edith Bernard, had just moved in. Together, they alone constituted the WHO team that would mobilize the global effort against an emerging plague-the acquired immunodeficiency syndrome (AIDS). Jonathan had recently come from Kinshasa where he led Projet SIDA, an innovative international program to reduce the already weighty burden of the human immunodeficiency virus (HIV) in Africa.