The Social Research Institute, founded at the University of Frankfurt in 1923, is known as the Frankfurt School, in short, in the social science literature. The Frankfurt School is also commonly referred to as Critical Theory. Especially, the analyses of Theodor W. Adorno (1903-1969), Max Horkheimer (1895- 1973), Walter Benjamin (1892-1940), Leo Lowenthal (1900-1993) and Herbert Marcuse (1898-1979) on culture, ideology and the media are very important. Karl Marx was not one of the scholars of the Frankfurt School.