Walter DahlkeWalter Dahlke was a German professor of electrical engineering at Lehigh University for 21 years. He started at Lehigh in 1964 as a visiting professor under the Senior Foreign Scientist Fellowship Program of the National Science Foundation. Dahlke previously served as the research director of Solid State Group Research Institute of AEG Telefunken in Germany, working on special physical and technical problems of electron tubes. He also served as the director of the Advanced Development and Applied Research Group tube and semiconductor department.