A mathematician.[ref]
https://www.math.ucla.edu/sites/default/files/newsletter/nl2016.pdf. UCLA Mathematics, Common Denominator, Fall 2016, printed p. 8: joint appointments in mathematics and economics; 1923–2016
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Lloyd Shapley was an influential American mathematician and economist, renowned for his work in game theory, particularly in the areas of cooperative games and the Shapley value, which assigns a value to each player based on their contribution to the overall payoff. His contributions have had a significant impact on economics, political science, and evolutionary biology. Shapley was awarded the Nobel Memorial Prize in Economic Sciences in 2012, jointly with Alvin E.