Tom Clark is the Director for the Center for Naturalism (CFN), an organisation which harbours the excellent resource Naturalism.Org. The Mission for CFN is stated as follows:

The Center for Naturalism (CFN) is an educational and advocacy organization devoted to increasing public awareness of naturalism and its implications for social and personal well-being. The CFN seeks to foster the understanding that human beings and their behavior are fully caused, entirely natural phenomena, and that human flourishing is best achieved in the light of such understanding.