Cohen was discovered by an agent from Wilhelmina Models walking down Sunset Boulevard in Los Angeles.

[1] He has been featured in campaigns for Dolce & Gabbana, Nike and Adidas, and was the face of Industrie with Miranda Kerr for two years.

Didier took part in being a judge on Australia's Next Top Model, as well as other TV shows.

Cohen has appeared in three short films (Nightcrawlers, Coincidence and Mind Games), directed by James Demitri Cohen competed in and was later eliminated from The Celebrity Apprentice Australia, where he was raising money for his charity, Youth Off The Streets.

TV appearance was as a mentor for the ninth season of Australia's Next Top Model.