He returned to France, to Paris, where he specialised in working with juvenile delinquents in the working-class 19th arrondissement where there was a sizable pied noir community.
He purchased a farm in southern France, in Alpes-de-Haute-Provence, and established the Bergerie du Faucon centre where troubled youngsters might be reeducated and reintegrated into society through work, contact with animals and nature, and self-respect.
Guy Gilbert is thought to be a mentor of and a father figure for Prince Laurent of Belgium.
A regular radio correspondent with Radio Notre-Dame, a frequent interviewee on television, a journalist with La Croix, and a prolific author, Guy Gilbert's appearance—his greying hair is long and flowing and he is usually seen in a battered leather jacket— and language are unorthodox.
On 12 December 2015 Gilbert officiated the Catholic marriage between Belgian singer Paul Van Haver, known as Stromae, and his wife Coralie Barbier in Martin's Patershof, a former church in Mechelen.