 He was a teacher and friend of the painter Félix Vallotton.Deeply anti-clerical, he was a great admirer of Jules Vallès, Kropotkin, Louise Michel, and Flora Tristan.Maurin received the support of Vollard and was a friend of Toulouse-Lautrecwho had his first individual exhibition with him in 1893and also of many other artists, including François-Rupert Carabin and the entertainer Aristide Bruant.