Together with Andreas Moberg Steffen Hindelang initiated CELIS in 2019 and is one of its directors.
He is also a professor (wsr) at the Department of Law of the University of Southern Denmark in Odense. He teaches and researches in the areas of international economic law, esp. international investment law, EU law and German public law. He is also adjunct faculty at Humboldt-Universität zu Berlin and Technische Universität Berlin as well as senior fellow at the Walter Hallstein Institute of European Constitutional Law at Humboldt-Universität zu Berlin and academic advisor to the International Investment Law Centre Cologne (IILCC).
Previously he was a professor at Freie Universität Berlin (2011-2017), senior research associate and senior lecturer at Humboldt-Universität zu Berlin (2010-2011), and research associate and lecturer at the University of Tübingen (2004-2009). He was guest professor, among others, at the Faculty of Law of the University of Uppsala as a Riksbankens Jubileumsfond – Alexander von Humboldt Stiftung Swedish Prize Laureate, at Nagoya University, Bocconi University Milan, the University of Lausanne, the Charles University Prague, the International Law School of the Moscow State Institute of International Relations (MGIMO), and the Turkish-German University Istanbul.
Furthermore, he regularly advises, inter alia, European governments in international investment disputes, overhauling national legislation on investment screening and international organisations, such as UNCTAD, on matters of reform of the current international investment law regime. Steffen is also fully qualified for the offices of a German judge and advocate. He was repeatedly invited by the European Parliament’s INTA Committee to prepare studies on the evolvement of the EU Common Commercial Policy in the area of investment. Since 2019, he serves at the ICSID Panel of Conciliators designated by the Federal Republic of Germany.