As well as his 'day job', Jérôme photographs people around his hometown in eastern France, shifting between their daily lives and the landscapes around them. He also takes part in longer-term projects, such as his So far from God, too close to the USA series, which focused on the impact of violence from the war between drug cartels in Mexico. Jérôme reveals that although each visit to a conflict zone has been challenging – with the time he spent in Syria in 2012 being particularly notable for how tough it was, both emotionally and in terms of danger – it has been the stories that he has followed in Mexico that have been most emotionally involving. So far from God, too close to the USA received a number of awards and was published in a book, The Wrong Side, in 2012. Since 2014, Jérôme has been regularly covering the conflict in eastern Ukraine.
Jérôme's work has also been published in distinguished publications such as Time, De Standaard, Le Monde and Stern, and he has exhibited at the Visa pour l'Image International Festival of Photojournalism in Perpignan, France, at the Rencontres d'Arles festival, and the French Ministry of Culture. His photographs are more than photojournalism, as he is keen to point out: "I don't like rigid categories. Sometimes there is art in journalism and journalism in art. Conscience, heart, beauty, balance and loss of balance are essentials for me."