Julien comes from a long line of musicians (Jean Schultheis is his father and Olivier, his brother). As a child, he continued in the family tradition by attending percussion, piano and theory classes.
His professional career began in the best way possible: he played drums with the orchestra at the Folies Bergères for Alfredo Arias' show, Fou des Folies.
Next he went on tour with Jane Birkin, Au Petit Bonheur, Frédéric Lo, Amok, Zazie, Raphaël, and Christophe Willem (musical direction).
Julien has been drumming for ten years, but he also plays keyboards, for example, while on tour with Zazie. After directing Hélène Ségara's album, he began composing film scores for TV and cinema: Z comme Zemour (directed by Henry-Claude de la Casiniere), Nadia Coupeau, dite Nana 1 and 2, with Lou Doillon (directed by Edouard Molinaro), Irène, with Cécile de France (directed by Yvan Calberac), Wasabi, with Jean Reno and Michel Muller (directed by Gérard Crawczyk).
He has worked in the studio with various performers (keyboards, drums and programming): Raphaël, Zazie, Christophe Willem, Indochine, Mikael Winter, Luc Besson, Patrick Bruel, Mud, Amok and Hélène Segara.