What field is listed for Richard Feynman's scientific career?

What field is listed for Richard Feynman’s scientific career? It is theoretical physics. Feynman was an American theoretical physicist whose work reshaped quantum mechanics and the study of elementary particles.

His most famous contributions include the path-integral formulation of quantum mechanics and quantum electrodynamics, or QED. He also introduced Feynman diagrams, a visual language physicists use to organize calculations involving interacting particles. He shared the 1965 Nobel Prize in Physics with Julian Schwinger and Shin’ichirō Tomonaga for foundational work on QED.

Feynman’s career also crossed major scientific institutions and projects. He earned his doctorate at Princeton in 1942, worked on the Manhattan Project at Los Alamos during World War II, taught at Cornell University, and later became a professor at the California Institute of Technology. His work on superfluidity and the parton model extended beyond the topics most associated with his public reputation.

The answer is not engineering or chemistry, even though Feynman studied broadly and worked on practical problems. Theoretical physics fits the field listed for his career and distinguishes him from experimental physicists, whose primary work involves designing and conducting measurements.