Richard P Feynman (Author) Richard Feynman was, until his death in 1988, the most famous physicist in the world. Only an infinitesimal part of the general population could understand his mathematical physics, but his outgoing and sunny personality, his gift for exposition, his habit of playing the bongo drums, and his testimony to the Presidential Commission on the Challenger Space Shuttle disaster turned him into a celebrity. Freeman Dyson, of the Institute for Advanced Study in Princeton, New Jersey, called him 'the most original mind of his generation', while in its obituary The New York Times described him as 'arguably the most brilliant, iconoclastic and influential of the postwar generation of theoretical physicists'. Bill Gates (Introducer) Bill Gates is a technologist, business leader, and philanthropist. In 1975, he cofounded Microsoft with his childhood friend Paul Allen. Today, he is cochair of the Bill & Melinda Gates Foundation, where he has spent more than twenty years working on global health and development issues, including pandemic prevention, disease eradication, and problems concerning water, sanitation, and hygiene. He has three children.