From 2009 to July 2014, Sébastien was part of Ballett Mainz (Germany) under the direction of Pascal Touzeau, first as a dancer in several choreographies by Pascal Touzeau, William Forsythe, and since 2011, as coordinator, ballet master and rehearsal director for Davy Brun, Johan Inger, Jiri Kylian, Douglas Lee,Georg Reischl, Pascal Touzeau, Didy Veldman. Since 2014, Sébastien Mari has been an international ballet teacher/assistant. He has been invited to share his ballet classes at Ballet du Rhin (France), Ballet de Genève, Ballet de Bâle and Théâtre de Saint-Gall (Switzerland), in Germany at Ballett Chemnitz, Tanztheater Giessen, Ballett im Revier, Ballett Koblenz, Ballett Saarbrucken, Tanztheater Regensburg, Tanztheater Nordhausen, Nationaltheater Mannheim, Tanztheater Münster, in the Netherlands at Introdans, Henny Jurriens Stichting, Korzo Theatre and Scapino Ballet, in Spain at Associació de Professionals de la Dansa de Catalunya.