 John Robert Schrieffer

John Robert Schrieffer (1931–2019) was an American physicist best known for his significant contributions to the field of condensed matter physics, particularly for co-developing the Bardeen-Cooper-Schrieffer (BCS) theory of superconductivity. This theory, formulated in 1957 along with John Bardeen and Leon Cooper, explains how certain materials can conduct electricity without resistance at low temperatures.