In the opinion of many critics and philosophers, we are entering an age of atheism marked by the waning of Christian fundamentalism and the flourishing of secular thought. Through alphabetically arranged entries written by expert contributors, this book profiles 27 iconic figures of unbelief whose ideas have shaped American society over the last 200 years. Included are entries on influential figures of the past, such as Albert Einstein and Voltaire, as well as on such contemporary figures as Richard Dawkins and Sam Harris. Each entry discusses the ideas and lasting significance of each person.