After graduating, Lewis’ initial career choice was to become an engineer. He made the eventual switch to economics because the governments and companies of British Colonies, such as St. Lucia, refused to hire blacks. At the age of 18, he would go on to earn a scholarship to attend the London School of Economics. Not only was this an opportunity for Lewis to study at perhaps the most prestigious University for Economics in the world, but he would also be the first black individual to ever gain acceptance at LSE. While enrolled, Lewis would achieve similar success here as he did in grade in school. Lewis’ academic superiority was noticed and admired by his peers and professors. While at LSE, Lewis had the opportunity to study under the likes of John Hicks, Arnold Plant, Lionel Robbins, and Friedrich Hayek. After gaining his Bachelor of Science degree in 1937 and a Ph.D. degree in 1940 at the London School of Economics (LSE) under supervision of Arnold Plant, Lewis worked as a member of the staff at the LSE until 1948. In 1947, he married Gladys Jacobs, and they had two daughters together.