Guillaume founded CORPCOM in 2014, the culmination of a long career in the media and financial and corporate communication. A former economic and financial journalist, notably at Le Figaro, and former financial analyst, Guillaume spent 10 years as Managing Director of the French office of a leading international strategic consulting network, where he notably created the "crisis and restructuring" department.

Guillaume is regarded as one of the France's leading crisis communications professionals, and his dual understanding of the media world and business world gives him unique expertise. He regularly appears in the media as an expert. In 2017, he published "Communication de crise: le manuel essentiel" (Ed. Télémaque).

Guillaume is a member of the ARE (Association pour le Retournement des Entreprises), of which he was secretary general and a member of the executive board for more than 12 years.

Guillaume completed his initial training in economics with several certificates from Harvard Business School. He now shares his experience and expertise through training programs for investment and financial professionals, as well as for students at universities (specialized master's degrees), MBAs at top schools, and communication schools.

Guillaume oversees all projects entrusted to CORPCOM.