Early phenomenology refers to the early phase of the phenomenological movement, from the 1890s until the Second World War. The figures associated with the early phenomenology are Edmund Husserl and his followers and students, particularly the members of the Göttingen and Munich Circles, as well as a number of other students of Carl Stumpf and Theodor Lipps, and excludes the later existential phenomenology inspired by Martin Heidegger. Early phenomenology can be divided into two theoretical camps: realist phenomenology, and transcendental or constitutive phenomenology.