The focal point of his studies lies in the critical theory of society and the history of ideas while his theoretical point of reference is the Critical theory of the Frankfurt School, with theorists like Max Horkheimer, Theodor W. Adorno or Herbert Marcuse, and of Karl Marx.
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In 1979 Stapelfeldt published his PhD Thesis, a reconstruction and interpretation of Karl Marx's Das Kapital with special reference to Marx's further studies and writings.
Gerhard Schröder | Gerhard Richter | Gerhard Müller (rower) | Gerhard Müller | Gerhard von Scharnhorst | Gerhard Munthe | Gerhard Zucker | Gerhard | Gerhard Markson | Gerhard Gentzen | Roberto Gerhard | Herman Gerhard Gade | Gerhard von Rad | Gerhard V of Jülich | Gerhard Riedmann | Gerhard Präsent | Gerhard Munthe (painter) | Gerhard Maria Wagner | Gerhard Ludwig Müller | Gerhard Heinrich Dieke | Gerhard Hanappi | Gerhard Frey | Gerhard Christoph von Krogh | Ken Gerhard | Heinz-Gerhard Haupt | Gerhard von Kügelgen | Gerhard von Graevenitz | Gerhard VI of Jülich, Count of Berg and Ravensberg | Gerhard VI | Gerhard Stahl |