Adam Smith is considered the father of modern economics. Smith was an 18th century Scottish moral philosopher, pioneer of political economy, and one of the key figures of the Scottish Enlightenment. Smith entered the University of Glasgow when he was fourteen and studied moral philosophy. Smith was a professor at Glasgow University. Smith wrote The Theory of Moral Sentiments and An Inquiry into Causes of the Wealth of Nations. The Theory of Moral Sentiments discusses how human morality depends on sympathy between agent and spectator, or the individual and other members of society. After his writings became well known he traveled widely lecturing in Europe.