Born of a gardener father and a caretaker mother, Jean Lebrun grew up in the Parisian suburbs and studied in the Catholic college Notre-Dame de la Providence at Enghien-les-Bains.
He collaborated at Combat, the TV program Le Jour du Seigneur in the 1970s, the magazine Esprit, whose editorial board he was a member, and La Croix, whose cultural service he co-directed.
The program was live from the Argentinian café El Sur on Boulevard Saint-Germain in Paris on Mondays, Tuesdays and Wednesdays, and in various French cities on Thursdays and Fridays.
He is the author of Journaliste en campagne (October 2006) and Le Journalisme en chantier : chronique d'un artisan[4] (October 2008), both published by the publishing house Bleu autour [fr].
In 2014, he was awarded the prix Goncourt de la Biographie for Notre Chanel, published by Bleu autour,[5] A biographical work on the fashion designer undertaken years earlier with his companion Bernard Costa (died of AIDS in 1990).