Jean-Pierre Liouville, member of the Socialist Party, was City Councillor of Marly (near Metz) in Lorraine, France from 1995 to 2020 and member of the Economic, Social and Environmental Council of Lorraine from 1998 to 2004. He is an elected Regional Councillor of Lorraine and then of the Grand Est from 2004 to 2021 and is Representative of the Regions of France at the Congress of Local and Regional Authorities of the Council of Europe since 2010.