After graduating, Daniel left for New York, where he trained at the Lee Strasberg Theatre Institute and HB Studios.
In 2006, he appeared in his first feature film in O Jerusalem, by Élie Chouraqui, alongside Ian Holm, JJ Feild and Patrick Bruel.
The two-part TV movie is an adaptation of William Shakespeare's King Lear set in Corsica, with Jacques Weber, Amira Casar and Jean Benguigui.
In 2010, Daniel joined 22 Bullets, a thriller about the Marseille mafia, alongside Jean Reno, Kad Merad, Jean-Pierre Darroussin, and Marina Foïs.
He followed up with historical roles as Titus Labienus, Caesar's powerful yet incorruptible general, in Titans That Built the Ancient World by Roel Reine.