Robert Schrieffer was an American physicist best known for his work in the field of superconductivity. He was born on May 30, 1931, and won the Nobel Prize in Physics in 1972, sharing it with John Bardeen and Leon Cooper for developing the BCS theory, which explains how certain materials can conduct electricity without resistance at low temperatures. Schrieffer earned his Ph.D. from Johns Hopkins University and later held positions at various institutions, including the University of California, Santa Barbara. His contributions to condensed matter physics have had a lasting impact on the understanding of quantum mechanics and material science. Schrieffer passed away on July 27, 2020.