Schwartz, Melvin (1932-2006), was an American physicist who studied the reactions of subatomic particles. In 1960, Schwartz collaborated with a team of people, including fellow Americans Leon Lederman and Jack Steinberger, trying to detect elusive particles known as neutrinos. Using a beam of neutrinos, the team discovered a new kind of neutrino called a muon, and new information about the structure of particles called leptons. For this work, Schwartz, Lederman, and Steinberger shared the Nobel Prize in physics in 1988.