He started his political career as an attaché at the cabinet of Jean-Maurice Dehousse in 1980–81. His first political mandate came in 1982, when he was Councillor of Mons (until 1985, and again from 1988 until 2000). In 1986, he was mayor of health, urban renewal and social affairs. Professionally, Di Rupo was at the same time cabinet member and then Deputy Head of Cabinet of the minister of finance of that time of the Walloon region and consequently Deputy Head of Cabinet of the minister of finance and energy of the Walloon region at that time Philippe Busquin (1981–85) and superintendent of the energy-inspection of the ministry of the Walloon region.