E.E. Slutsky is perhaps the Russian/Ukrainian economist most quoted by mainstream economists today. This is the first research monograph to examine the life and work of the internationally-renowned economist and mathematician. It does so from both a `history of economics` perspective and a `history of science` perspective, bringing these two strands together in order to demonstrate Slutsky`s enduring legacy as an innovative researcher and an influential intellectual. It also presents some of Slutsky`s lesser-known (and hitherto-unavailable) works in English translation.