Franz Josef Strauss
In 1975 Rittner portrayed Franz Josef Strauss, Chairman of the CSU and Prime Minister of Bavaria by order of the CSU-faction in Bonn. In 1977 he painted Hans-Jochen Vogel, Lord Mayor of Munich (1960–1972) by order of the Bavarian State Capital, as well as in 1996 Hans Zehetmair, Secretary for Cultural Affairs. Impressionism turned out to be the most appropriate way to paint characteristically.