At the London School of Economics his work was largely on sociology and political science. At the same time he continued his work in philosophy. He won the John Stuart Mill studentship three times in succession. Ginsberg incidentally acquired a good working knowledge of French and German, and outside his main sphere of studies, he took courses in biology, chemistry and physics. In 1914 he passed the MA examination with special distinction. His thesis consisted of a dissertation on the philosophy of Malebranche and was accompanied by a translation of his "Discourses on Metaphysics" (1923).