Langmann began his career as an actor in his father's films when he was a teenager, earning Cesar Award nominations for Most Promising Newcomer for Les années sandwiches in 1988 and Paris s'éveille in 1991, as well as a nomination for Best Supporting Actor in 1993 for Le nombril du monde.

[1][2] In 2011, Langmann produced the black and white, silent film The Artist with director Michel Hazanavicius.

[4] He was invited to join the Academy of Motion Picture Arts and Sciences in June 2012 along with 175 other individuals.

[5] Langmann was born in Paris, France, the son of Anne-Marie Rassam and film director Claude Berri.

His father Claude Berri was Jewish, and his mother Anne-Marie Rassam, who was born in Lebanon, was Syrian Christian.