When Clapham began to teach economic history at Leeds in 1902 Schmoller had just finished his Foundations of Political Economy, and the first edition of Sombart's Modern Capitalism had just appeared. In the early editions of J. A. Hobson's Evolution of Modern Capitalism many aspects of the Marxian interpretation of history were effectively expressed and afforded a clear measure of the stimulus that economic history was to receive from this general approach. But these influences were not the dominant factor in Clapham's thought at the beginning of his career or at any later period. His interests in history came from Lord Acton and from Alfred Marshall. Marshall was anxious to draw him into the field of economic history, “he was eager to get historical work done.” Clapham says in the Inaugural Lecture, “… he pointed out to me tracts of economic history which needed someone's work. Then he pointed at me and said—‘Thou art the man.’ I hesitated then, for Acton's power was on me, as I hope it still is. But Marshall has prevailed.”