Study of economics at Cologne University (1963/1964) and at Freie Universität Berlin (1964/1969). 1969 Master of Economics (Diplom-Volkswirt). Doctoral degree 1983 at the Technical University Berlin with a thesis on the economics of renewable energies.
Since 1969 at German Institute for Economic Research in Berlin, which is an independent, non-profit-making scientific institute and is one of the leading research institutes in Germany: From 1982 to 2004 head of department "Energy, Transportation, Environment". From April 2004 up to the end of 2006 Senior Executive in this department. Since 2007 independent consultant. Managing director of the working group "Energy Balances" since 1994, which is responsible for the energy balances in the Federal Republic of Germany (see: www.ag.-energiebilanzen.de). Senior Policy Advisor at Ecologic– Institute for International and European Environmental Policy.
In his scientific career, Hans-Joachim Ziesing has conducted a large number of studies as well as numerous publications with a wide spectrum of topics. This reflects his specific interests, including: analyses, forecasts and scenarios concerning the energy field, energy statistics and indicators, economics of specific energy systems with emphasis on renewable energies and combined heat and power systems, interdependency between economy, energy and environment, analyses of the environmental impacts of different energy strategies, recommendations in the field of energy and environmental policies, climate protection policies, and emissions trading. Finally, Hans-Joachim Ziesing was highly engaged with basic studies on the German National Allocation Plan for the periods 2005-2007 and 2008-2012 as well as for the period post 2012 within the framework of the Emissions Trading Scheme of the European Union. Currently he is working on topics concerning the National Climate Protection Initiative of the German Government. For several years he has accompanies the energy and environmental policy with his academic advice. He publishes widely on these subjects and is invited regularly as an expert to participate in and speak at relevant conferences and workshops. Member of an advisory group for the ministries of environment of the Czech Republic and of Israel as well as policy advisor in energy and environmental policies for the ministry of energy of Luxemburg and Namibia.
Member in numerous advisory boards, e.g. 1983 to 1985 Enquete Commission of the Parliament of Berlin “Energy Policy in Berlin”, 1986 to 1987 Organising Committee of the IEA-Workshop on the Economics of Renewable Energy, 1986 to 1988 ad-hoc committee, Federal Ministry of Research and Technology ‘Solar based hydrogen economy’, 1989 to 1992 Enquete Commission of the Parliament of Schleswig Holstein “Energy Future in Schleswig Holstein”, 1995 to 1998 scientific committee associated to a research project of the Federal Agency of Environment “Material flows and energy demand with the extraction of raw materials. Recommendations for a sustainable development”, 2000 to 2002 Enquete Commission "Sustainable Energy in the Context of Liberalisation and Globalisation" of the 14th German Bundestag, 2003 to 2004 „National Advisory Committee (NAC)“ to the International Conference for Renewable Energies 2004, 1989 to 2006 chairman (1989 to 1999) and member of the energy commission, since 2007 chairman of the Climate Policy Advisory Group of the Berlin Senate (Government of Berlin), 2005 to 2011 Delegate of the Consultative Commission on Industrial Change (CCMI), a body within the European Economic and Social Committee (EESC).