He then spent two years as a commis de cuisine trainee under Alain Chapel at his hotel and restaurant in Mionnay, in the Rhône-Alpes region near Lyon.

[1][3] After undertaking basic training with the French Army, from February 1982 to March 1983 he served his military service at the Élysée Palace, working for both Presidents Valéry Giscard d'Estaing and François Mitterrand.

[3] Having served his apprenticeship and training mainly away from the Roux brothers' British businesses, he joined his uncle at the Waterside Inn, in Bray, Berkshire in 1985, before working with his father at Le Gavroche from the April of the same year.

[4] In August 2023, Roux announced that he would be closing Le Gavroche to focus on a better work-life balance without the daily demands of a busy Michelin-starred restaurant.

Roux has made various television appearances, including on his friend Gordon Ramsay's ITV produced Hell's Kitchen, and as an expert judge on the BBC Two programme MasterChef: The Professionals (2008–13).

In March 2014, Roux announced that he was leaving the BBC due to a conflict over his brand ambassadorship for Albert Bartlett Rooster potatoes.

[8] Roux was a judge on Five Star Kitchen: Britain's Next Great Chef; a culinary competition series that aired during June-July 2023 on Channel 4.