»Siegfried Katterle (1933-2019). His works in the Light of the Political Theology of Paul Tillich« Siegfried Katterle (1933-2019) was Member of the Gerhard Weisser-»School«, was teaching and researching about macroeconomics and economic policy, was criticising the paradigm of methodological individualism and of the normative individualism of market liberalism from the alternative perspective of institutionalism, was following the ethical socialism in the mode of religious socialism of the circle of the political Theology of Paul Tillich, including the social economics of Eduard Heimann.