   Rickert is considered the head of the so-called Southwestern or Baden school of Neo-Kantianism, whose exponents worked in the philosophy departments at Freiburg and Heidelberg, both in the region of Baden in southwestern Germany. The Southwestern school stands in contrast to the so-called Marburg school, spearheaded by Hermann Cohen (1842–1918) and continued by Paul Natorp (1854–1924) and Ernst Cassirer (1874–1945). (For an overview of the two schools see Crowell 1999.)