As of July 2020, he serves as a member of the executive team to the Mayor of Paris, Anne Hidalgo, in charge of the transformation of public spaces, as well as transportation, mobility, rules and regulations on city streets, and the management of roads.

Belliard was born on 29 May 1978 in La Teste-de-Buch[3] and was raised in Augicourt, near Vesoul, in rural France, in a working-class family.

In March 2019, Belliard put forward his candidacy for mayor as the Green Party candidate in the 2020 municipal elections.

[14] On 11 February 2020, Belliard said that while he condemned violence against individuals and property, it was important to understand the root causes behind the invasion of BlackRock's headquarters by ecological activists in Paris.

[17] As of 3 July 2020, Belliard serves as a member of the executive team to the Mayor of Paris, Anne Hidalgo, responsible for the transformation of public spaces, as well as transportation, mobility, rules and regulations on city streets, and the management of roads.