Dr. Koops studied electron-optics with Prof. Möllenstedt for PhD at University Tübingen, DE in 1971.The changed to Prof. Scherzer at TU Darmstadt for chromatically and spherically correction of aberrations in the TEM. He worked at IBM T.J. Watson Research Center in State of New York for 1,5 Years (1985-87) on single beam material deposition. 1989: Deutsche Telekom Res. Ctr. Darmstadt, high resolution electron beams. In 2000 he founded NaWoTec GmbH for E-Beam mask-repair, now as ZEISS world market leader. 2006 retired. 2009 to 2015 Consultant at Hitachi High Technology, Japan. Chief of HaWilKo GmbH. 165 Papers, including 60 patents.