The CES (Constant Elasticity of Substitution) production function was developed by Arrow, Chenery, Minhas, and Solow in their seminal 1961 paper. It's often called the ACMS function. B.S. Minhas was the 'M' in this pioneering work, making him directly associated with the CES production function. Joan Robinson worked on imperfect competition, Manmohan Singh is a policy economist, and A.K. Sen is known for welfare economics.