The German Working Group on Energy Balances (AG Energiebilanzen), Berlin/Germany, said farewell to Hans-Joachim Ziesing after many years on the board of executives and in the management team. Ziesing joined the working group shortly after it was founded in 1971 and has been a member of the association‘s management since 1994. Ziesing will be succeeded on the board of executives and in the management team by Hans Georg Buttermann, an economist working in Münster.