He was born at Champsecret (Orne), and studied painting under Émile Bin and Alexandre Cabanel.

[2] From 1887 Léandre figured among the exhibitors of the Salon, where he showed numerous portraits and genre pictures, but his popular fame is due to his comic drawings and caricatures.

The series of the "Gotha des souverains," published in Le Rire, and Léandre's other work like that seen in L'Assiette au Beurre placed him in the front rank of contemporary caricaturists.

Léandre produced admirable work in lithography, and designed many memorable posters, such as the "Yvette Guilbert."

Léandre won a bronze medal at the Exposition Universelle in 1889 for a large size painting:[2] la Mère ou « Dormio cor meum vigilat » ("Je dors mais mon coeur veille").