In 1966 he became a full member of the German Academy of Sciences and was Director of the Berlin-Babelsberg Observatory of the Academy of Sciences. Following reorganization in 1969, he headed the newly established Central Institute for Astrophysics, in which the previously independent observatories in Potsdam, the Babelsberg Observatory, the Sonneberg Observatory and the Karl Schwarzschild Observatory, Tautenburg were summarized. Until 1973, he also led the research field of cosmic physics at the Academy of Sciences, in astrophysics and geophysics. Then he gave to health reasons and focused on the management of the ZIAP. He not only made it a center of theoretical gravitational physics, but also included magnetohydrodynamics - which played an important role in astrophysics on a par with the gravitational theory in the model training - and geophysics, which was formative in Potsdam later. On Albert Einstein's 100th Birthday, 1979, he managed to secure a summer house by Einstein in Caputh, Brandenburg as a guest of the Academy in consultation with the administrators of the estate of Otto Nathan and Einstein. In 1982 he handed over the ZIAP to his successor, Karl-Heinz Schmidt. Treder was director and founder of the Laboratory of Einstein Academy in Potsdam Caputh he remained until 1992. He has published in the last years of his life with his friend, the geophysicist Wilfried Schröder, many works in the Earth and space physics, including solar variability. In addition, the edition of the book Einstein and geophysics, as well as some volumes of the works of Hans Ertel. Focus of their work was the solar minima and the physical consequences for the solar activity. Treder was chairman of the International Society "History of Geophysics and Cosmical Physics". Treder enjoyed high reputation in the GDR and the full confidence of the political leadership, and he enjoyed privileges such as full freedom to travel and own chauffeur driven car. Calls from the West declined from Treder, he was not only an avowed Marxist, but also felt the history of science in Berlin closely connected, about which he later wrote some books. He lived later on the grounds of the Babelsberg Observatory, but was increasingly maverick and was after the turn not retain its leading role in the scientific organization, from which he had but retired early as the 1980s, when he turned increasingly to the History of Science and the philosophy of science turned. Treder was a member of the Leibniz-Sozietät.
Works
He unfolded a high scientific productivity and published nearly 500 individual contributions and more than 20 monographs.
Monographs on gravitational physics
Gravitational shock waves. Non-analytic wave solutions of Einstein's field equations, Akademie-Verlag, Berlin 1962
