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​Jean Medernach specialises in administrative law, particularly in city planning, building regulations and the environment.

He also has extensive knowledge in civil liability cases, both contentious and non-contentious.

He has been a member of the Luxembourg Bar since 1963.

Prior to the creation in 1988 of Arendt & Medernach as a result of the merger of Arendt & Harles and Mersch & Medernach, he was a partner of Mersch & Medernach.

Jean Medernach, Docteur en Droit, studied at the Université Paris I Panthéon-Sorbonne and Aix-en-Provence (France).