Clemens Ziegler has broad experience in German and EU competition law, EU State aid law, energy and environmental law, and general EU law. Clemens assists clients, for instance, in relation to merger control (if needed also regarding Foreign Direct Investment (FDI) control), cartel investigations (including atypical cartels), abuse of dominance cases, and vertical issues (e.g., distribution systems or technology transfer), or with the development and implementation of compliance and training programs.

 

In the area of EU State aid law, Clemens handles State aid complaints before the European Commission, and he assists with challenging Commission State aid decisions. Clemens has litigation experience both in the European and German courts.

 

Clemens offers advice in the fields of energy and environmental law, e.g., in the electricity sector (demand response) and in renewable energies for the transport sector. Clemens has experience with EU fisheries law.

 

In addition to being active as external counsel, Clemens’ experience also includes periods of in-house legal advice. Clemens has been recognized by Who’s Who Legal (now Lexology) from 2018 to 2024 as a ‘future leader’ in competition and as a ‘recommended lawyer’ in competition (2025).

 

Clemens’ native language is German; he is fully professionally proficient in English and Italian, fluent in French, and has a basic knowledge of Spanish and Dutch. Clemens is a member of the bars of Frankfurt (Main), Germany, the State of New York (USA), and of Brussels (French-speaking section – E-List).

 

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Education

2009                LL.M. (Georgetown University Law Center, Washington DC, USA)

 

2009                Doctorate in Public International Law (Marburg University, Germany)

 

2005                 Second State Law Exam (State of Rhineland-Palatinate, Germany)

 

2003-2005     Practical Legal Training (Regional Court of Frankenthal, State of Rhineland-Palatinate, Germany, and Brussels, Belgium)

 

2003                 First State Law Exam (State of Bavaria, Germany)

 

1997-2003     Law degree (University of Würzburg, Germany, including accessory studies in European lawin Erasmus studies in Pavia, Italy (1999-2000))

Publications/Speaking/Teaching

2026

2025

2024

2023

  • Course taught: International Merger Control, Rome Business School (2023).

2022

2021

2020

2018

  • Participating in panel titled ‘Capacity mechanisms under scrutiny’ at the Energy Community’s conference on Competition Law in the Energy Sector, Vienna, December 2018
  • Participating in panel titled ‘State Aid Hot Topics’ in FSR’s workshop on Competition Law and the Energy Sector, Brussels, October 2018
  • Speaking at 100th Lunch-Talk of GCLC – Global Competition Law Centre, Brussels, in a Panel on Antitrust and merger control law in times of Brexit, Brussels, May 2018
  • The Treaty State Aid Framework – Friend or Foe in the Energy Transition?’ (online lecture in FSR’s summer programme, titled Unpacking the Legal Content of the Clean Energy Package, May 2018)
  • What are the Consequences of Brexit on Competition Law and Policy Enforcement?’ at FSR workshop The Impact of Brexit on the UK and European Energy Markets, London, April 2018
  • What is State Aid?’ and ‘Germany’, chapters contributed to Leigh Hancher, Adrien de Hautecloque, Francesco Maria Salerno, State Aid and the Energy Sector, February 2018 (co-authored with Dr Falk Schöning)

2016

  • New issues in EU Security of Gas Supply’. Moderating a Session at the Florence School of Regulation’s EU Energy Law and Policy Workshop, Berlin, February 2016

2014

  • The European Commission’s Extension of the Liner Shipping Consortia Block Exemption Regulation until April 2020’, Journal of European Competition Law & Practice (JECLAP) 2014 (co-authored with Matthew Levitt)

2010

  • Getting the Deal Through When Time is of the Essence. Antitrust Strategies for Time Sensitive Transactions’, in: ABA, Section of Antitrust Law, The Threshold, Newsletter Of The Mergers & Acquisitions Committee, Spring 2010 (co-authored with Gregory M. Sergi)

2009

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