AIP Emilio Segrè Visual Archives, Segrè Collection · Attribution

Worked out how the weak nuclear force and electromagnetism are, at a deeper level, the same force — a unification that also predicted the existence of the weak neutral current, later confirmed experimentally. He shared the 1979 Nobel Prize in Physics with Abdus Salam and Steven Weinberg for the theory, and has spent his career since at Harvard and Boston University.