Winfried Schulke Professor Emeritus Institute of Physics University Dortmund Germany 1959-1966 Scientific Assistant, Institute of Experimental Physics, Martin-Luther-University, Halle/Saale, GDR 1966-1975 Head Assistant, Section of Physics, Martin-Luther-University, Halle/Saale, GDR 1975-1977 Scientist at the Institute of Physics, University of Dortmund 1977-1980 Assistant Professor of Physics, University of Dortmund 1980-2001 Full Professor of Physics, University of Dortmund 2001- Present Professor Emeritus, University of Dortmund