Whereas Moisil's early contributions were in mathematics, he later devoted his scientific activity to mathematical logic and computer science. He was a professor of mathematical logic and computer science at the University of Bucharest, and he also taught Boolean logic at the Politehnica University of Bucharest. In 1957 he assisted in setting up the first Romanian computer in the Institute of Atomic Physics, and he encouraged several of his students to learn computer programming. Thus, he played a fundamental role in the development of computer science in Romania, and in raising the first generations of Romanian computer scientists. Furthermore, several of Moisil’s books had an impact on the beginning of computer science: Incercari Vechi Si Noi in Logica Neoclasica and Old Approaches in Neoclassic Logic, 1953; Teoria Algebrica a Mecanismelor Automate Theory of Automata, 1959; and Circuite cu Tranzistori Circuits, 1961. These books were translated into several languages, including Russian and Czech. He furthermore gave lectures at various universities in Europe and North America.