His grandfather, Marcel Marx, was a Polish Jewish refugee and communist resistant during World War II.

[1] Thierry Marx thought of becoming a baker, but later joined the Compagnons du Devoir in 1978 and graduated with a degree (CAP) of pastry chef, chocolatier and ice cream parlor.

[1] At his return to France, he went through various jobs, including being a security guard, a cash transporter and a warehouseman, but finally went back into cooking.

Noticed in his brigade, he finds himself head chef at the Regency Hotel in Sydney (Australia) and travels a lot (Singapore, Hong Kong, Tokyo).

[12] From February 2010 to April 2014, he was one of the jurors for the Top Chef program on M6 with Ghislaine Arabian, Christian Constant and Jean-François Piège.

[citation needed] In 2013, he collaborated with the brand 3 Suisses for which he co-created with the visual artist Mathilde de l'Écotais,[15][16] a capsule collection.

[18] He participates, as a coach, in the program Un village à la diète broadcast on July 20, 2018, on TF1, alongside nutritionist Vanessa Rolland, athletics trainer Renaud Longuèvre, and Miss France 2011 Laury Thilleman.

[19] Also in 2018, he appeared in the series Joséphine guardian angel in his own role in episode 1 of season 19 entitled Graine de chef.