Carl Hewitt

Carl Hewitt is known for his pioneering work on the Actor model of computation, which is a mathematical model used for concurrent computation.

The Actor model of computation is a mathematical model that represents concurrent computation as a collection of independent, isolated units called actors. Each actor can communicate with other actors by sending messages to them.

In addition to the Actor model, Carl Hewitt has also made significant contributions to areas such as Artificial Intelligence, Expert Systems, and Semantic Web. He co-authored the influential paper "A universal modular actor formalism for artificial intelligence" with Peter Bishop and Richard Steiger in 1973.

Carl Hewitt was a professor at the Massachusetts Institute of Technology (MIT) for many years. He has also held positions at other universities and research institutions, including the University of Toronto and the Artificial Intelligence Laboratory at Stanford University.

As of my knowledge cutoff date, Carl Hewitt is still active in his field. However, it's always a good idea to verify this information through more recent sources.