Maier-Leibnitz was also a member of the Arbeitskreis Kernreaktoren (Nuclear Reactor Working Group) of the DAtK, and it was considered to be the most active and influential board of the DAtK. Some of the other members of the group were Erich Bagge, Wolfgang Finkelnburg, and Karl Wirtz. For the first decade of nuclear energy development in the Federal Republic of Germany (FRG), it was the center of decision making, and it had representative membership from German industry. Maier-Leibnitz was also the chairman of a special committee for designing the Deutsches Atomprogramm (German Nuclear Program). From this position, he became the architect of the first full-scale nuclear program of the FRG.