Lang partook in the productions as an associate member of the Nordey troupe at the Théâtre des Amandiers and had roles in such plays as The Triumph of Love, Venus in Furs, A Flea in Her Ear, Philosophy in the Bedroom and Tartuffe.
Lang was in the film and television productions of Les Misérables, Father of My Children, Neuilly Yo Mama!, Accomplices, The Beautiful Person and Le Divorce.
[3][9] From 1993, Lang began playing theatre roles,[1] and she partook in the productions of Nanterre-Amandiers until 1998,[7] while also serving as an associate member of the Nordey troupe at the Théâtre des Amandiers.
[8] She was due to play the part of Phaedra in the production of Phèdre by Yiannis Ritsos at the Théâtre de la Ville in Paris from January 2014.
[4][8][12] In the 2007 French legislative election, Lang stood in the seat of Modem in the third constituency of Hauts-de-Seine as a deputy for the candidate Jean-Louis Ragot for the Democratic Movement political party.
[9] Lang was committed to raising awareness of undocumented immigrants with Emmanuelle Béart, Balasko and the Droits Devant association,[5] particularly in certain districts of Hauts-de-Seine.
[8][12] In 2009, Lang signed a petition in support of Polish film director Roman Polanski, calling for his release after he was arrested in Switzerland in relation to his 1977 charge for drugging and anally raping a 13-year-old girl.