Prof. Hermann Wollnik’s work has taken him around the world and includes collaborations with the European Space Agency, the GSI research center in Darmstadt, Germany or with CERN in Geneva, Switzerland, with the Los Alamos and Oak Ridge National Laboratories in the United States as well as with the University of Osaka, Japan. After retiring from the Justus Liebig University in Giessen, Germany in 2001, he took up new collaborations with the New Mexico State University in Las Cruces, NM, United States and the GSFC of the NASA in Baltimore, MD, United States as well as with the KEK/RIKEN Research Institute in Tokyo, Japan. Prof. Wollnik’s main scientific work has concentrated on mass determinations and, thus, nuclear binding energies of isotopes of short-lived heavy and super heavy elements as well as on the identification of organic molecules on the earth and space objects as for instance on a comet head in the ROSETTA space mission. Among many different ideas were new proposals and designs of energy-isochronous time-of-flight mass spectrographs, for high- and low-energy ions, the developments of which he started in the mid-1970s.