I ka hoʻoholo ʻana ua makemake ʻo ia i hoʻololi, hoʻomaka ʻo Stéphane e ʻimi i kahi hana ma kahi hui e pili ana i ke kumu. Ua komo koke ʻo ia i kahi hui kōkua kanaka, ʻo Télécoms Sans Frontières, i ka wā o ke Kaua Kosovo. Ua hana ʻo Stéphane ma laila no aneane 5 mau makahiki, e alakaʻi ana ma mua o 30 mau mikiona pilikia ma ke ʻano he poʻo o ka hana a me ka hoʻomohala ʻana.
Ma 2003, haʻalele ʻo ia iā TSF a hui pū me Surfrider Foundation Europe ma ke ʻano he Luna Nui. I nā makahiki o Stéphane ma ke ʻano he poʻo o ka hui ʻo Surfrider i lilo i NGO alakaʻi kaiapuni ma ʻEulopa, e lanakila ana i nā lanakila nui ma ka mālama kai. Ma ka manawa like, ua hāʻawi ikaika ʻo Stéphane i ka hoʻokumu ʻana o ka Moana a me ka Climate Platform, ka mea i hiki ke loaʻa no ka manawa mua i ka hoʻohui ʻana o ka moana i loko o ka kikokikona o ka ʻaelike ea ma COP21 ma Paris. Mai ka makahiki 2018, ua hana ʻo Stéphane ma ke ʻano he kūkākūkā kūʻokoʻa e kākoʻo ana i nā papahana pili i nā kumu. He lālā nō hoʻi ʻo Stéphane o ka Economic, Social and Environmental Council i ka Aquitaine Region ma Farani a noho ʻo ia ma ka papa o nā NGO like ʻole a me nā kālā e hana ana ma ke kahua o ka mālama ʻana i ka moana, ka mālama ʻana i ke kaiapuni, a me ka hoʻokele waiwai, me: ONE a me Rip Curl Planet Fund, World Surfing Reserve Vision Council, a me 1% no ka Planet, Farani.