sentences:  In 1960-61 he worked under Robert R. Wilson at Cornell University to be introduced to elementary particle physics, namely the use of electron scattering to study the structure of the proton and neutron.Schopper was appointed Professor at the University of Karlsruhe in 1961 and Director of the newly established Institutes for Experimental Nuclear Physics of TH Karlsruhe and the Karlsruhe Nuclear Research Centre.In order to continue his research on electron scattering he set up a group to carry out one of the first experiments at DESY.