The Philosopher Volunteer is an adaptation of Plato’s famous ‘Philosopher King’ ideology. Plato wanted society to be ruled by a wise and learned philosopher king. It is tough to argue with Plato, but this book aims to establish that it is easier to create an alternative, the philosopher volunteer.The world faces four mega crises: Wealth inequality. Depletion of natural resources. Overpopulation. Environmental degradation.The answer to these mega crises is the philosopher volunteer. Twenty-first century philosophy must integrate ancient Indian philosophy, classical Greek philosophy and the philosophy of empirical science. This book seeks to argue why that is the case.