In April 1997, he was a postdoctoral research fellow at Technical University, Braunschweig and in July 1997, he was Alexander von Humboldt Research Fellow at Technical University of Berlin.
He was a postdoctoral research fellow at Technical University. This was in April 1997. Technical University was Braunschweig. He was Alexander von Humboldt Research Fellow at Technical University of Berlin. This was in July 1997. This was in April 1997.