Lespert made his film debut in 1995, in
Laurent Cantet's short film
Jeux de plage, alongside his father. His first major role came in 1999, in
Jacques Maillot's film
Our Happy Lives. The following year, he appeared in another Cantet film,
Human Resources, which earned him a
César Award for Most Promising Actor in 2001. Lespert's career took off and he appeared in several films, playing a wide range of characters, such as a sensual gardener in
Sade, a body builder addict in
Vivre me tue, a boxer in
Virgil, a pretentious artist in
Alain Resnais's
Not on the Lips, and a journalist in
Robert Guédiguian's
The Last Mitterrand. Lespert directed his first film in 2007,
24 mesures, featuring
Benoît Magimel and
Sami Bouajila. ==Personal life==