Lack of medical license\n\n While some doctors openly praise Black Jack's for his surgical abilities, others disdain him for not having a license. The manga explains that he lost his medical license when he went against his superiors orders and performed a surgery on his lover who had late stage ovarian cancer.

John 'Black Jack' Anderson (d 1842?) was an African-American sealer and pirate active in the Recherche Archipelago off the south coast of Western Australia.