Nils Andersen is Professor of Physics at the Niels Bohr Institute of the University of Copenhagen. His main activities include experimental and theoretical studies of atomic collisions involving optically prepared states. Recent research interests include cold and ultracold collisions. Klaus Bartschat is the Ellis & Nelle Levitt distinguished Professor of Physics at the Department of Physics and Astronomy at Drake University. His research in theoretical and computational atomic physics focuses on combining the general theory of measurement with highly accurate numerical calculations. He is a fellow of the American Physical Society and has published 2 books, 50 book chapters, 12 review articles, and more than 300 papers on electron and photon collisions with atoms and ions.
