He was also head of the Belgian bar association, professor of law, playwright and journalist.

The Symbolist poet Émile Verhaeren frequented Picard's literary salon and worked as a law intern at Picard's office between 1881 and 1884 before abandoning his legal career in favour of writing; Verhaeren too went on to receive multiple nominations for the Nobel Prize in Literature.

Picard propagated virulent racism and antisemitism in his works, such as Synthèse de l’antisémitisme (1892, reprinted 1942) and En Congolie (1896).

He interpreted human society and its conflicts through the prism of race, claiming that Jews are "parasitic" and that Black people are "imitators like the apes".

[2] Bernard-Henri Lévy considers him to have been the "first consistent disciple of Arthur de Gobineau" and "the inventor of French-style national socialism".