When a teenager, he committed himself to the service of other people, as a member of the scout movement or as an instructor for the Red Cross Children's Hospital in Margency (Val-d’Oise) .

Parallel to his studies, he has always earned his living thanks to student's jobs, -for instance in the Domont Driving school-, and freelance contribution to news papers such as La Gazette du Val-d’Oise or to free radio stations.

1995 is the landmark of both his election as the mayor of Domont (Val-d’Oise, 15000 inhabitants) and his active commitment in Jacques Chirac's successful presidential campaign.

Anxious to preserve his professional activity in the private sector, he created his own consultancy office, C and C, in 1997and worked successively for investment funds, industrial groups and management societies.

In 2002 Jérôme Chartier appeared on the political national scene: on 16 June 2002 he was elected deputy of the 7th constituency in Val-d’Oise (townships of Domont, Ecouen, Montmorency, Sarcelles Sud-Ouest) with almost 58% of the votes.

He notably became official recorder for the Finance Commission for 4 laws: concerning the protection of business companies (2003) the opening up of the DCN capital (2004), the purchasing power (2007) and the bank and financial regulation (2010).Being recognized as a specialist of budgetary matters, he became the UMP Group spokesman on the State budget in 2007.

On 22 April 2004, the anniversary of the presidential election first ballot, he gave over to the National Assembly President 15 propositions put forward by his group.

To continue this reflection, in September 2005, he published Le lifting de Marianne, 50 propositions (l’Archipel), which benefited from a fairly exceptional success for a political book.

In 2013 Les Entretiens celebrated their 10th anniversary and, nowadays, have become one of the major political think tank in France, the absolute must in December for all the decision makers from all horizons.