Klaus Junack was directly involved in the flight of Kurt Aland from East Germany (Halle/Saale) into the Federal Republic of Germany (West Berlin) in 1958. Subsequently he fled himself with his family to West Germany, and in the following year in March 1959, he became the first research assistant at the Institute for New Testament Textual Research which had just been founded by Kurt Aland at Münster University in the previous month (see the anniversary post).
Subsequently, Junack took on a number of duties and responsibilities at the INTF as well as the Münster University over the years (academic director, curator, etc.) and he was heavily involved in the production of several Nestle-Aland editions of the Greek New Testament as well as the UBS Greek New Testament, the preparation work for the new Editio Critica Maior, e.g., the Text und Textwert project. As I was working on my own edition of Jude, I took great benefit from his Das Neue Testament Auf Papyrus I: Die Katolischen Briefe co-edited with Winfried Grunewald, published in 1986.
The INTF obituary has been published today, here.