This collection of papers proposes to trace the professional and personal fortunes of Maffeo Pantaleoni (1857-1924), an eminent and controversial Italian economist from the liberalist culture which in the early twentieth century perceived the shortcomings and dangers of the nascent monopolist concentrations. He was one of the founders of what we can today call the Italian school of economics and finance. These contributions examine his life, thought and works and his reputation since his death. His vital influence on economic history.