Guillaume holds a Master’s degree in Econometrics and a DEA in Strategy and Management from HEC-ESSEC-Université Paris X. He began his career in consulting before joining Pfizer, where he was responsible for developing the Health Economics division.​ ​

A few years earlier, Guillaume Bouchara, in collaboration with the President of Pfizer, had founded Agipharm, an association of American research laboratories present in France, of which he has since held the position of Executive General Secretary.​ ​

Since 1999, Guillaume Bouchara has acted as a consultant to numerous executives, key players in the healthcare sector and public authorities. ​ ​

Twenty-five years after the creation of Nextep, Guillaume Bouchara now heads one of the leading consulting firms in the healthcare and pharmaceutical sectors.​