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 accelerator, Drell made significant scientific contributions. Not content to leave science in the lab or classroom, Drell brought his intellectual heft to public service, advising the US government on issues relating to science, advocating for Russian dissident Andrei Sakharov, and urging nuclear disarmament. Scaling the heights of achievement with a down-to-earth sensibility, Drell met his destiny empowered and validated by a prodigious mind, generous spirit, and tact in fostering goodwill for the benefit of all.