Claus MontonenClaus K. Montonen received his Ph.D. from the University of Cambridge in 1974 and later held positions at the Université de Paris XI (CNRS), the Research Institute for Theoretical Physics, Helsinki, and CERN. He held various senior faculty positions n the Department of Physics at the University of Helsinki from 1978 until his retirement in 2011, where he was responsible for curriculum design in theoretical physics. His research interests are in S-matrix theory, string theory and quantum field theory, having made major contributions to early string theory and duality in field and string theory. Read More Read Less