Jeffrey Goldstone (1933‑2026) was a MIT professor emeritus, Dirac Medalist, and a towering figure in quantum field theory and quantum optimization algorithms.\n\nHis most celebrated contribution is the Goldstone theorem and the associated Goldstone bosons. Inspired by superconductivity, Goldstone proved that a spontaneously broken continuous symmetry inevitably gives rise to massless, spin‑0 particles—now called Goldstone (or Nambu‑Goldstone) bosons. Together with Abdus Salam and Steven Weinberg he formalized the theorem, providing a cornerstone for the Standard Model and early‑universe cosmology.\n\nIn the early days of string theory, Goldstone collaborated with Claudio Rebbi, Charles Thorn, and Peter Goddard to develop light‑cone quantization of relativistic strings, a foundational result for later string dynamics. His work with Roman Jackiw and Frank Wilczek uncovered soliton structures in quantum field theory.\n\nLater in his career he turned to quantum information science, co‑creating several novel quantum algorithms. With Edward Farhi, Samuel Gutmann, and Michael Sipser he gave the first proof that certain oracle problems (learning parity) cannot be sped up by a quantum computer; they also introduced quantum adiabatic computation, a concept that directly inspired the D‑Wave company and subsequent superconducting quantum hardware. Their Quantum Approximate Optimization Algorithm (QAOA) provided worst‑case performance guarantees for combinatorial optimization and has amassed over 6,000 citations. In 2019 the team applied QAOA to the Sherrington‑Kirkpatrick model, showing that, in the infinite‑size limit, increasing depth with optimal parameters approaches the celebrated Parisi value.\n\nGoldstone’s academic path spanned nearly five decades: after early work at Cambridge, Harvard, CERN, and Copenhagen, he joined MIT in 1977 and served as director of the Center for Theoretical Physics (now CTP‑LI) from 1983 to 1989. He was elected Fellow of the American Physical Society, the Royal Society, and the American Academy of Arts and Sciences, receiving the Guthrie Medal, the Dannie Heineman Prize, and, with Stanley Mandelstam, the Dirac Medal for clarifying spontaneous symmetry breaking in relativistic field theory.\n\nColleagues described him as “mathematically brilliant, able to apply abstract tools to concrete physical problems,” and praised his modest, witty demeanor. As Frank Wilczek noted, Goldstone’s ideas have become part of the very fabric of modern physics.\n\nHe is survived by his son Andrew Goldstone, an associate professor of English at Rutgers, his daughter‑in‑law Anne Dewitt, and his granddaughter Helen. A memorial service is planned for 2027.\n\nReview: Goldstone’s legacy exemplifies the power of interdisciplinary insight—linking nuclear theory, string quantization, and quantum algorithms—while consistently grounding profound mathematics in sharply defined physical problems.