Simon was invited to Carnegie Mellon University in 1949. He first served as a professor of administration and psychology (1949 ~ 1955), and then served as a professor of computer science and psychology for life. Simon, as one of the founders of the Graduate School of Industrial Management, initiated research in two academic fields: organizational behavior and management, and undertook the work of organizational theorist, management scientist and business school administrator. He guided and helped graduate school become one of the best business schools in America.

Simon not only teaches in famous universities, but also is active in business, administrative agencies and various consulting companies. He has a unique view on the study of organizational theory in management. He is not only a pioneer of professional research, but also a representative scholar of behavioral science.

Simon's erudition is enough to impress the world. He has successively obtained nine doctor's degrees: doctor's degree in political science from Chicago University 1943, doctor's degree in science from Case Institute of Technology 1963, doctor's degree in science from Yale University 1963, doctor's degree in law 1963, doctor's degree in philosophy from Lund University in Sweden 1968,/. Doctor of Economics, Erasmus University, Rotterdam, 1978, Doctor of Law, University of Michigan, 1979, Doctor of Law, University of Pittsburgh. The Swedish Academy of Royal Sciences concluded: "In the broadest sense of economics, Simon is first and foremost an economist, and his name is mainly related to the structure and decision-making in economic organizations, which is a quite new field of economic research."

Simon's first contribution to management science was to put forward the decision-making function of management. Before Simon, Fa Yueer first divided the management functions in theory. At this time, decision-making was included in the planning function, and subsequent management scholars did not question it. It was not until the 1940s that Simon put forward the argument that decision-making is the primary function of management, and decision-making was valued by management scholars. The vigorous development of today's decision theory is inseparable from Simon's pioneering contribution in this field. Simon's second contribution to management is to establish a systematic decision-making theory. Before Simon, he put forward the proposition of bounded rational behavior and the criterion of "satisfactory decision-making", and microeconomics also conducted in-depth research on individual behavior in the market. Simon believes that the completely rational economic man model has two defects. First, people cannot be completely rational, and it is difficult for people to have a complete understanding and correct prediction of the results that each measure will produce. On the contrary, people often make decisions based on subjective judgment to some extent without full understanding. Second, it is impossible to list every scheme in the decision-making process. One is that people's ability is limited, and the other is that the cost of the decision-making process is limited. The decision people make is not to find the best among all the schemes, but to find the one that can meet the requirements among the known schemes.

His main works include: decision theory in management behavior, economics and behavioral science, new science of management decision-making, artificial science, human problem solving, thinking model, etc.