At Manchester University in 1954 Lewis wrote the work, entitled “Economic Development with Unlimited Supplies of Labour” for which he received the Nobel Prize for Economics in 1979 alongside Chicago, Illinois economics professor Theodore Schultz. He followed the article with a well-received overview of development economics called “The Theory of Economic Growth.” In both articles, Lewis attached enormous importance to education and social development as agents of change. He argued they provided guidelines used all over the world by a variety of institutions and governments for promoting economic growth.
In addition to his many academic achievements, Lewis made a mark in public affairs, during and after World War II advising the British Colonial Office about the ways Britain could alter its economic relations with colonial territories in preparation for their independence. He also advised governments moving towards independence. In 1957, for example, when Ghana gained its independence, Lewis became the country’s chief economic adviser, helping to shape its first Five Year Development Plan (1959-1963).
After leaving Ghana in 1959, Lewis became principal and then the first vice chancellor of the University of the West Indies. He was knighted by Queen Elizabeth in recognition of his service to the Commonwealth in 1963. In the same year (1963) he became a professorship of political economy at Princeton University where he remained until he retired in 1983. Lewis remained an active scholar until his death on June 15th, 1991 at the age of seventy six.