Featured in the 2018 Netflix documentary series Chef's Table: France, Couillon's seafood restaurant La Marine, which he inherited from his parents and which he now runs with his wife Celine, has received a three-star rating from the Michelin Guide.

He applied for a job under Fornareso, demonstrating his early talent with his mother's apple pie recipe.

[3] Couillon later worked for Michelin star-awarded chef Michel Guerard, but soon got a call from his father who offered him to take over their island restaurant.

Couillon and his wife, after some hesitation, moved back to the island to save the ailing restaurant.

[3] The Michelin Guide has stated that Couillon's "six- or nine-course tasting menu (is) constantly renewed according to the tight flow consignments from the garden and the fishermen.