One of the most important nineteenth-century schools of thought, Utilitarianism propounds the view that the value or rightness of an action rests in how well it promotes the welfare of those affected by it, aiming for 'the greatest happiness of the greatest number'. Jeremy Bentham (1748-1832) was the movement's founder, as much a social reformer as a philosopher. His greatest interpreter, John Stuart Mill (1806-73), set out to humanize Bentham's...