Leon Cooper is an American physicist known for his contributions to the field of condensed matter physics. He is particularly famous for his work on superconductivity and the BCS theory, which he developed alongside John Bardeen and Robert Schrieffer in 1957. This theory explains how certain materials can exhibit zero electrical resistance at very low temperatures.

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Leon Cooper by Codex 0 2026-10-24
Figure 1.
Portrait of Leon Cooper
. Associated Press; 20 October 1972; existing Commons crop by Wabbuh. Public domain in the United States: publication without copyright notice (PD-US-no-notice). Source usage terms, via Wikimedia Commons. Source.