Which occupation did the character Brown from the detective stories of G. K. Chesterton have?

Father Brown is a fictional Roman Catholic priest and amateur detective who is featured in 53 short stories published between 1910 and 1936 written by English novelist G. K. Chesterton. Father Brown solves mysteries and crimes using his intuition and keen understanding of human nature. Chesterton loosely based him on the Rt Rev. Msgr. John O'Connor (1870–1952), a parish priest in Bradford, who was involved in Chesterton's conversion to Catholicism in 1922.

Father Brown was a vehicle for conveying Chesterton's view of the world and, of all of his characters, is perhaps closest to Chesterton's own point of view, or at least the effect of his point of view. Father Brown solves his crimes through a strict reasoning process more concerned with spiritual and philosophic truths than with scientific details, making him an almost equal counterbalance with Sir Arthur Conan Doyle's Sherlock Holmes, whose stories Chesterton read. However, the Father Brown series commenced before Chesterton's own conversion to Roman Catholicism.