Professor Johannes Geiss. Geiss was a was a German-Swiss physicist. He worked at the University of Bern(e) in Switzerland and developed an ingeniously simple solar wind sail (Solar Wind Collector experiment SWC) which was set up by the two Apollo 11 astronauts on the moon. 'Mission Mond – Eine Reise mit Apollo 14', Verkehrshaus Luzern, Switzerland (February 26, 2010).