The ascendency of administrative research provided an effective foil for critics. Theodor W. Adorno, who had worked under Lazarsfeld at the Radio Project, came to represent an intellectual tradition that contrasted with Lazarsfeld's own dedication to empiricism and willingness to collaborate with industry. Likewise, Lazarsfeld's focus on empirical discovery rather than grand theory ("abstract empiricism" in the words of C. Wright Mills) was one of the spurs that led Robert K. Merton to develop what he called "theories of the middle range".