Sébastien Mari began his dance education in the Conservatory of his hometown La Rochelle (France) with Colette Milner , Marie Paule Cantenys, Karin Wahener and Bertrand Papillon. After graduating with the Gold Medal of the Conservatories of France, he started his career in 1989 with the Jeune Ballet deFrance 7 and 8 (France) under the direction of Robert Berthier before joining Nederlands Dans Theater (The Netherlands), with Jiri Kylian. After 6 years with NDT he joined the Compania Nacional de Danza (Spain) with Nacho Duato, where he remained for 4 years. He then joined Ballet Gulbenkian (Portugal) directed by Iracity Cardoso and Paulo Ribeiro for 3 years.

Since 2014, Sébastien Mari is an international ballet master/assistant .
He has been invited to share his ballet classes to the Ballet du Rhin (France), to the Ballet de Genève, Basel Ballet and Theater St Gallen (Switzerland), in Germany to Ballett Chemnitz, Tanztheater Giessen,
Ballett im Revier, Ballett Koblenz, Ballett Saarbrucken, Theater Regensburg Tanz, Theater Nordhausen, Nationaltheater Mannheim, Tanztheater Münster, in The Netherlands to Introdans, Henny Jurriens Stichting, Korzo Theater and Scapino Ballet , in Spain to Associació de Professionals de la Dansa de Catalunya to assist and to stage different works in Ballett im Revier from Bridget Breiner , David Dawson, Pontus Lidberg, in Les Grands Ballets Canadiens (Montreal) with bridget Breiner, Tarek Assam in Tanztheater Giessen, Pascal Touzeau in Theater Nordhausen, Justin Peck in Paris, in Barcelona, Thomas Noone, Robert Bondara in Theater Chemnitz, and more particularly from Jeroen Verbruggen with Ballett im Revier, Ballet Moscow, Leipziger Ballett, Ballet du Grand Théâtre de Genève, Ballett Theater Basel and Staatsballett Karlsruhe.

As to pre-professional and dance formations, he also proposes and teaches a variety of repertoire workshops from renowned choreographers Jiří Kylián, David Dawson, Georg Reischl, Pascal Touzeau, Jeroen Verbruggen.

He gave his master classes and workshops to Conservatoire National de La Rochelle and Conservatoire National Supérieur de Lyon in France, Art Factory International in Bologna, Italy, to Accademia Nazionale di Roma, In Portugal to Pallco and in Spain, to ARTdance International Dance Program, to IBStage (artistic director of IBStage Contempo 2019), La Companyia, Centre de Dansa de Catalunya, Institut del Teatre, to Obrador de Moviments, IEA Oriol Martorell, to Campus Adam Valencia.

From his own experience, with a variety of cross training methods such as Yoga, Gyrotonics and Alexander technique, and with ballet teachers which he admires and learnt a lot from throughout his career, Sébastien has developed a system of teaching ballet classes which is basic and comprehensive for professional contemporary dancers and challenging for professional ballet dancers.