Sidney Drell (1926–2016) left a legacy worthy of many lifetimes. Physicist, professor, national security expert, amateur musician, behind-the-scenes diplomat, and champion for peace and human rights, he was also friend and mentor. Dozens of interviews with those whose lives he touched reveal Drell as a man of brilliance, curiosity, and passions, whose devotion to the arts, family, and community equaled his love for physics. Teaching at Stanford University and working at its linear particle...