In addition to his occupation as a physician, which he practised from 1841,[3] Delacour turned progressively to the theatre.
[4] He collaborated with Eugène Labiche and Clairville for several vaudevilles [5] Le Courrier de Lyon (1850) was one of Delacour's noted plays.
The play was based on the story of Joseph Lesurques, an innocent man who was executed after he was mistaken for the leader of a gang who brutally murdered a courier.
[6] Aside from his collaborations with Labiche and Clairville, Delacour also worked with Lambert Thiboust on Le diable (1880), a French drama.
[7] Some of the playwright's vaudeville plays inspired Clement Scott and Arthur Matthison's Great Divorce Case (1876) and James Albery's The Pink Dominos (1877).