Self-taught guide, from Marseille every day since the 1990s Mathias offers historic urban walks to all types of audiences. Recently graduated in History at the University of Aix-Marseille, the walks and shows offered are intended to highlight Marseille’s heritage and its history. Traditional walks, sound or theatrical walks, he multiplies the forms of expression to reach as many people as possible, but above all to never get bored. Mathias is also part of the MarsImperium research program which brings together five research laboratories from Aix-Marseille University. This project aims to highlight the links between Marseille and the former colonies of the French Empire by evoking the actions and implications of Marseille actors (politicians, industrialists, etc.) in the facts of colonization. The Marseille urban public space is also studied, the colonial traces still present are listed, analyzed, studied, and replaced in their original contexts to be better understood by all.