Giorgio held the academic rank of
professor at the
University of Messina from 1909 to 1914, in
Rome from 1915 to 1924, and in
Milan from 1924 to 1938. He was also the director of the
Giornale degli economisti from 1910 to 1938. Giorgio lived in Berlin between 1907 and 1908, where he worked with L. von Bortkiewicz on
probability theory and particularly on the law of rare events. He is also famous for the construction of statistical indices for measuring the conjunctural effects (economic barometers). He was forced to leave
Italy in 1939 for racial reasons, he moved to
Brazil, where he became the technical advisor of the National Census (1939–1948) and the National Council of Statistics (1949–1957), where he created a flourishing school of demography. In 1954 he was nominated for the role of the president of the
International Union for the Scientific Study of Population, of which he became the Honorary President (1957). In 1956, he returned to teach at the University of Rome, where he was appointed
professor emeritus in 1961.{{Citation| last = Mortara| first = Giorgio| title = Italian Economic Statistics: A Reply to Professor Salvemini| journal = Political Science Quarterly| volume = 46 ==Education==