Enquma ukuthi ufuna ushintsho, uStéphane waqala ukufuna umsebenzi enhlanganweni ehlobene nezimbangela. Ngokushesha wajoyina inhlangano yokusiza abantu, i-Télécoms Sans Frontières, phakathi neMpi yaseKosovo. U-Stéphane wasebenza lapho cishe iminyaka emi-5, enza imisebenzi yezimo eziphuthumayo engaphezu kuka-30 njengeNhloko Yezokusebenza Nokuthuthukiswa.
Ngo-2003, washiya i-TSF futhi wajoyina i-Surfrider Foundation Europe njenge-CEO. Phakathi neminyaka ka-Stéphane njengenhloko yenhlangano i-Surfrider yaba yi-NGO ehamba phambili kwezemvelo eYurophu, yazuza ukunqoba okukhulu kwezokongiwa kolwandle. Ngesikhathi esifanayo, u-Stéphane waba neqhaza elikhulu ekwakhiweni kwe-Ocean and Climate Platform, ekwazile ukuthola okokuqala ukuhlanganiswa kolwandle embhalweni wesivumelwano sezulu ku-COP21 eParis. Kusukela ngo-2018, u-Stéphane usebenze njengomeluleki ozimele osekela amaphrojekthi amaningi ahlobene nezimbangela. U-Stéphane futhi useyilungu loMkhandlu Wezomnotho, Wezenhlalakahle Nezemvelo esifundeni sase-Aquitaine e-France futhi uhlala ebhodini lama-NGO ahlukahlukene kanye Nezikhwama ezisebenza emkhakheni wokongiwa kolwandle, ukuvikelwa kwemvelo, kanye nomnotho wezenhlalakahle, okuhlanganisa: ONE kanye ne-Rip I-Curl Planet Fund, i-World Surfing Reserve Vision Council, kanye no-1% wePlanethi, eFrance.