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English mathematician with contributions in finite groups, knot theory, number theory, combinatorial game theory, and coding theory. Known for inventing the cellular automaton called the Game of Life.

John von Neumann (Hungarian: margittai Neumann János Lajos) was a Hungarian American[1] mathematician who made major contributions to a vast range of fields,[2] including set theory, functional analysis, quantum mechanics, ergodic theory, continuous geometry, economics and game theory, computer science, numerical analysis, hydrodynamics (of explosions), and statistics, as well as many other mathematical fields. He is generally regarded as one of the foremost mathematicians of the 20th century. The mathematician Jean Dieudonné called von Neumann "the last of the great mathematicians." Even in Budapest, in the time that produced Szilárd (1898), Wigner (1902), and Teller (1908) his brilliance stood out. Most notably, von Neumann was a pioneer of the application of operator theory to quantum mechanics, a principal member of the Manhattan Project and the Institute for Advanced Study in Princeton (as one of the few originally appointed), and a key figure in the development of game theory and the concepts of cellular automata and the universal constructor. Along with Edward Teller and Stanislaw Ulam, von Neumann worked out key steps in the nuclear physics involved in thermonuclear reactions and the hydrogen bomb.

Political activist, economist, and United States military analyst. Released the Pentagon Papers, a top-secret Pentagon study of U.S. government decision-making in relation to the Vietnam War.

Theory of transactional analysis based on the ideas of Freud and Carl Jung. Focuses on analyzing patients' social transactions for gaining insight into their personalities.

Research Scientist @MITSloan. Director @MIT_ACT. Lecturer @HarvardEcon. Motivating people to do good.