For G.W.F. Hegel, phenomenology is an approach to philosophy that begins with an exploration of phenomena (what presents itself to us in conscious experience) as a means to finally grasp the absolute, logical, ontological and metaphysical Spirit that is behind phenomena. This has been called a "dialectical phenomenology".
For Edmund Husserl, phenomenology is "the reflective study of the essence of consciousness as experienced from the first-person point of view." Phenomenology takes the intuitive experience of phenomena (what presents itself to us in phenomenological reflexion) as its starting point and tries to extract from it the essential features of experiences and the essence of what we experience. When generalized to the essential features of any possible experience, this has been called "transcendental phenomenology". Husserl's view was based on aspects of the work of Franz Brentano and was developed further by philosophers such as Maurice Merleau-Ponty, Max Scheler, Edith Stein, Dietrich von Hildebrand and emmanuel lévinas.
Martin Heidegger believed that Husserl's approach overlooked basic structural features of both the subject and object of experience (what he called their "being"), and expanded phenomenological enquiry to encompass our understanding and experience of Being itself, thus making phenomenology the method (in the first phase of his career at least) of the study of being: ontology.
The difference in approach between Husserl and Heidegger influenced the development of existential phenomenology and existentialism in France, as is seen in the work of Jean-Paul Sartre and Simone de Beauvoir. Munich phenomenologists (Johannes Daubert, Adolf Reinach, Alexander Pfänder in Germany and Alfred Schütz in Austria), and Paul Ricoeur have all been influenced. Readings of Husserl and Heidegger have also been crucial elements of the philosophies of Jacques Derrida and Bernard Stiegler.
