His father sang in a well-known church choir (Les Petits Chanteurs de Saint Marc).

He studied at the Lee Strasberg Institute in New York between 2008 and 2009 to perfect his acting and English, returning to France to sing in Les Enfoirés charity concerts.

[1] Maunier gained fame for his starring role in the 2004 French film Les Choristes, in which he plays Pierre Morhange, a delinquent with an exceptional singing voice at the correctional school Fond de L'Étang.

[2] Following the release of the film, Maunier and the choir took part in numerous concerts all over the world, including Japan and Canada.

In April and August 2005, he took part in a four-episode television series for France 2, Le Cri, playing a young steelworker.

[citation needed] Upon entering collège (middle school), Maunier was asked to make a choice between various activities.