Heath Ledger was in I'm Not There.
Professor Alfred Kroner -LRB- 8 September 1939 in Kassel , Germany -RRB- is a retired Professor of Geology at Johannes Gutenberg University of Mainz in Mainz , Germany .. Johannes Gutenberg University of Mainz. Johannes Gutenberg University of Mainz. He specializes in the pre-Cambrian geology of Africa .. pre-Cambrian. pre-Cambrian. The American Journal of Science , published by Yale University , in dedicating a special issue to him on his 60th birthday , said that it was celebrated with a symposium in Mainz .. American Journal of Science. American Journal of Science. Yale University. Yale University. It was here at the Johannes Gutenberg-University that Alfred was appointed full Professor of Geology in 1977 .. Since then ... he continues to conduct his activities over several continents as a truly cosmopolitan geoscientist of overwhelming efficiency , recognized and appreciated worldwide in the Geoscience community .