John Marsh was born in 1947 in Cleveleys Lancashire and educated at Blackpool Grammar School and the universities of Lancaster and Oxford. His study of history and philosophy led to a lifetime interest in these subjects and especially on the impact of Enlightenment thinking on society. He taught history briefly before working in law and commerce. In 1997 he established a property investment business in London. He is married with three grown-up boys. His book The Liberal Delusion examines liberalism in the light of recent scientific discoveries, and argues that liberalism's core belief in human goodness is false, unscientific and harming society. His conclusion is that society has become too liberal, and that we urgently need to reappraise liberalism and separate out the positive, such as the commitment to greater social justice, from the negative - excessive freedom and loss of morality.