In its essence, Critical Theory is Western Marxist thought with the emphasis moved from the liberation of the working class to broader issues of individual agency. Critical Theory emerged in the 1920s from the work of the Frankfurt School, who sought to diagnose and cure the ills of society. Bronner provides sketches of major critical thinkers such as George Lukács and Ernst Bloch, Theodor Adorno and Walter Benjamin, Herbert Marcuse and Jurgen Habermas, as well as many of its seminal texts and empirical investigations.