William James's was an intellectual landmark, paving the way for current study of psychology, philosophy and religious studies. In this new companion to the , key international experts provide contemporary responses to James's book, exploring its seminal historical importance and its modern significance. Locating the within the context of James's other works and exploring James's views on psychology, mysticism, religious experience, emotion and truth, the sixteen articles offer new analyses of the from the perspectives of postcolonial theory, history, social theory and philosophy. As the only critical work dedicated to the cross-disciplinary influence of , this book testifies to William James's genius and ongoing legacy.