From 1956 on, he studied philosophy and sociology under the critical theorists Max Horkheimer and Theodor Adorno at the Johann Wolfgang Goethe University Frankfurt am Main. Because Horkheimer had asked Habermas to make some changes to his dissertation. Habermas did not want to do this, and thought that the Frankfurt School was not correct in its views of modern culture. Habermas left the Frankfurt School (a school of thought rather than one made of bricks and mortar). 