There is a clearly discernible thread running through Johann P. Arnason's whole work. Starting with a highly sophisticated discussion of the Marxian term `praxis' in the 1970s he was increasingly able to link his insights to macro-sociological questions. In the 1980s, focusing particularly on the notions of `power' and `culture', he formulated a theory of modernity which challenges the diagnoses of other major contemporary social theorists such as Habermas, Giddens, Castoriadis and others.