A member of ACAT France, which he joined in 1990, Benoît Théry held responsibilities as a member of the regional coordination team in the Île-de-France region in the following years.

After training in economics and management and initial experience in the service of French Catholic Education, his professional activities as a consultant in international human resources development led him to numerous assignments, including in 16 African countries (including two long-term expatriations).

This international experience motivated him to join FIACAT in 2015, after having carried out an "audit of the organisation and action of FIACAT in response to its missions.

In June 2020, Benoît Théry was elected a member of the FIACAT International Bureau for a four-year term; he holds the position of Treasurer.