Professor Grossman's introduction to the revolutionary work of Husserl, Heidegger and Sartre studies the ideas of their predecessors too, explaining in detail Descartes's conception of the mind, Brentano's theory of intentionality, and Kierkegaard's emphasis on dread, while tracing the debate over existence and essence as far back as Aquinas and Aristotle. For a full understanding of the existentialists and phenomenologists, we must also...