Short answers, pulled from the story.
Barry Edward O'Meara (1786-1836) was an Irish surgeon who served as ship's surgeon when Napoleon surrendered and subsequently became Napoleon's personal physician during his exile on Saint Helena. He was a medical graduate of Trinity College Dublin and a founding member of the Reform Club.
O'Meara published Napoleon in Exile, or A Voice From St. Helena in 1822, a book that charged the island's governor Sir Hudson Lowe with mistreating the former emperor. Its appearance created considerable public sensation. O'Meara also sent secret letters from Saint Helena to a clerk at the Admiralty in London, recording Napoleon's state of mind as a captive.
O'Meara performed the very first medical operation ever carried out on Napoleon: the extraction of a wisdom tooth, in the autumn of 1817.
Michael Williams portrayed Barry O'Meara in the 1972 Anglo-American historical drama film Eagle in a Cage.
O'Meara sent clandestine letters from Saint Helena to a clerk at the Admiralty in London without the knowledge of those overseeing Napoleon's captivity. The letters shed light on Napoleon's state of mind as a prisoner and the causes of his complaints against Sir Hudson Lowe and the British government.
Kathleen O'Meara was Barry O'Meara's granddaughter. She was a Catholic writer based in Paris.