[6][8] He was in a relationship with the French actress Aure Atika with whom he had a daughter (Angelica) and then with Dyane de Serigny with whom he had two other children (Pénélope and James).

[9] Zdar and Boombass started working together in 1988, producing albums for the French hip-hop artist MC Solaar.

In 1991, they created their first project, called La Funk Mob, and the following year, they started to increasingly experiment with electronic sounds.

Zdar's experience with electronic music was influential in his involvement with Étienne de Crécy in the project Motorbass, who released a solo full-length album, Pansoul.

The music videos for "Cassius 1999" and "Feeling for You" portrayed the character Deadman, from DC Comics, as a DJ superhero.

[10][non-primary source needed] Cassius's song "I <3 U So" was sampled on the track "Why I Love You" on Jay-Z and Kanye West's 2011 collaboration album Watch the Throne.

[11] On 19 June 2019, two days before the release of Cassius's fifth album Dreems, Zdar died after accidentally falling from a building in Paris.

[17] He unveils on 14 May 2020, "Pour que tu", which is present on EP Le virage, consisting of 5 songs and released on 5 June 2020.