sentences:  In 1950, Jentschke became a resident assistant professor, and in 1955 resident professor, in the Department of Physics at the University of Illinois at Urbana–Champaign.In 1951, he became director of the Cyclotron Laboratory there.During 1956 and 1957, Jentschke was a member of the "Arbeitskreis Kernphysik" (Nuclear Physics Working Group) of the "Fachkommission II "Forschung und Nachwuchs"" (Commission II "Research and Growth") of the "Deutschen Atomkommission" (DAtK, German Atomic Energy Commission).