Sébastien started to play ultimate in Sherbrooke in 2002. He played with Gecko (Sherbrooke), Méphisto and Odyssée (Montréal) and now Iznogood (Paris). He was involved in the Quebec Ultimate Federation from its creation in 2007 until its official recognition by the governement in 2011 and president in 2008-09. He is the creator of the Quebec Ultimate 4x4 Circuit (CQU4) and its ranking algorithm. After a Ph. D. in math, he is currently a postdoc in Paris.