Peter Claes graduated in Managerial Economics at the Catholic University Leuven in 1984 and was Research Assistant in the same department until 1986. From 1987 until 1992 he was Research Department Analyst of the Belgian Economy at the BBL in Brussels. In 1992 he became Director of the Economic Department of essenscia (Federation of the Chemical Industry and Life Sciences, previously called FEDICHEM), where he was General Manager from 2002 until end 2008. He also became Board Member of FEBELIEC (Federation of Belgian Industrial Energy Consumers) in 1994, and from May 1996 until May 2003, he was President of this same federation. Since November 1998, he has been Vice-President of IFIEC Europe (International Federation of Industrial Energy Consumers), and was also President of this federation between April 2003 and 2007. Since January 2009, he has been full time active for FEBELIEC.