Poganiza kuti akufuna kusintha, Stéphane anayamba kufunafuna ntchito m’gulu linalake lokhudzana ndi ntchito. Posakhalitsa analowa m’gulu lothandiza anthu, la Télécoms Sans Frontières, pa nthawi ya nkhondo ya ku Kosovo. Stéphane anagwira ntchito kumeneko kwa zaka pafupifupi 5, ndipo anachita maulendo opitirira 30 adzidzidzi monga Mtsogoleri wa Ntchito ndi Chitukuko.
Mu 2003, adachoka ku TSF ndikulowa Surfrider Foundation Europe ngati CEO. M’zaka za Stéphane monga mkulu wa bungweli Surfrider anakhala bungwe loyang’anira zachilengedwe lotsogola ku Ulaya, ndipo linapambana kupambana kwakukulu pankhani yosunga nyanja. Panthawi imodzimodziyo, Stéphane adathandizira kwambiri pakupanga nsanja ya Ocean and Climate Platform, omwe adakwanitsa kupeza kwa nthawi yoyamba kuphatikizidwa kwa nyanja m'mawu a mgwirizano wanyengo ku COP21 ku Paris. Kuyambira 2018, Stéphane wagwira ntchito ngati mlangizi wodziyimira pawokha pothandizira ma projekiti angapo okhudzana ndi zifukwa. Stéphane akadali membala wa Economic, Social and Environmental Council ku Aquitaine Region ku France ndipo akukhala pa bolodi la mabungwe osiyanasiyana omwe siaboma ndi Ndalama zomwe zikugwira ntchito yosamalira nyanja, kuteteza zachilengedwe, komanso zachuma, kuphatikiza: ONE ndi Rip Curl Planet Fund, World Surfing Reserve Vision Council, ndi 1% ya Planet, France.