This study traces the evolution of English classical political economy: it focuses particularly on the noteworthy contributions of Nassau William Senior. Senior was among the foremost intellectuals of his age. Born in 1790, he had at an early period prepared himself for the legal profession. He was called to the Bar in 1819. But his chief interest was political economy. Finding the attraction irresistible, Senior finally gave up the lucrative practice of law and became a professor of political economy at Oxford. His first stint at the university [1825-1830] was followed by a few excursions into the realm of applied economics. He returned to Oxford in 1847 for another term of five years. Senior was something of a rebel. He jettisoned such basic tenets of orthodox economic thinking as the Malthusian principle of population and the cost-of-production approach to value. Among the English classics, he had most claim to the title of having anticipated some of the main ideas of the ‘marginal revolution’. His views on the scope and methodology of economics bore a good deal of resemblance to those of the neo-classicals. He was lauded for his quasi-subjective value theory by Stanley Jevons. He reformulated the wages-fund doctrine by grafting productivity analysis on to it.