Gilles Mercier is self-taught and committed to the medium of photography and to the Lumen Collective. Having decided upon this path, he moved to Paris to complete his formal technical training with the Iris Centre.

A collaborator with the Explorer agency and several collectives including SyncroX, as well as foundations such as the Raoul Follereau Foundation,Gilles Mercier currently works on multiple institutional orders and as the photographic assistant to AC Barbier.

Following diverse photographic exhibitions, it was his work in reportage that directed him towards social action.

Currently director of a social housing unit, he is reinvesting in his medium.