His father owns the prestigious Espace Rozier, which is the central base of the Marionnaud team, in Bois-le-Roi, Seine-et-Marne.

Additionally, since 2001, Rozier has played an integral part in the show jumping training of Charlotte Casiraghi.

In July 2005, an FEI arbitration court suspended Rozier for three months from the show jumping sport after he was disqualified from the Mediterranean Games.

He hired an attorney to appeal the suspension, insisting that he was blameless and that there was no rational motive or evidence to the contrary.

[3] In October 2003, with ten-year-old grey mare Aber Hallo Marionnaud, he won the Grand Prize at the CSI* Barbizon.