Steven Weinberg (1933-2021) was a theoretical physicist and Nobel laureate who contributed tremendously to particle physics. Until his death, Weinberg was regarded by many as the greatest living scientist. His most well-known work was the formulation of electroweak theory for which he earned the 1979 Nobel Prize with Sheldon Glashow and Abdus Salam, but his research spanned many other fields. Examples include effective Lagrangians, quantum chromodynamics, supersymmetry, quantum gravity, and cosmology.Weinberg’s publications were renowned not only for their profundity and originality but also for their devastating logic and clarity. This volume brings together 37 of his most significant papers, together with commentaries, providing today’s physicists with easy access to these seminal papers. More than just a collection, this selection by editor Michael Duff places each article into a comprehensive overview, providing the reader with the scientific and historical context of Weinberg’s finest papers.