After a Bachelor in Social Sciences at the Neuchâtel University in 2006, he worked at Berlin at the Institut für Mobilitätsforschung of the BMW group and then at the applied geography department of the Freie Universität. Sébastien joined the Observatoire Universitaire de la Mobilité of the Genève University in 2008 before entering Prof. Vincent Kaufmann's team at the LaSUR in 2011.