His 1889 painting Christ attacked by a mob made when he was only 22 years old established his reputation as an innovative Symbolist painter and ensured his admission to the progressive artistic circles in Brussels.

He also frequented many writers, including his future son-in-law Emile Baumann, Stéphane Mallarmé, Guillaume Apollinaire, Oscar Wilde, Léon Bloy – with whom he maintained a fusional friendship – Verlaine, Zola, Heredia, Gide, Milosz, Remy de Gourmont and Joris-Karl Huysmans.

Henri de Groux exhibited all over Europe at the salons of Paris, Brussels, Ostend, Spa, Amsterdam, London and Florence.

She married Emile Baumann who after his father in law's death wrote a revealing biography[5] titled The terrible life of Henry de Groux (1936).

[7][8] Apollinaire wrote of De Groux's exhibition in Paris at the Salon d'Automne 1911, saying the artist's work "...gives one the impression of an immense labor and a sensibility of the highest order..." Paintings Prints and graphics