Active in the waste management business since 1994, Barthelemy started his career in Austria and then Hungary with a company specializing in waste collection and landfilling. Since 2001 he has worked for the French organization TIRU, which today is Dalkia Wastenergy, part of EDF Group. Developing waste management programs such as MBT, AD, composting and ERC plants including Chagny (France) or Gdansk (Poland). From 2014, Barthelemy has been Head of International Development at Dalkia Wastenergy.