Strange Case of Dr Jekyll and Mr Hyde is the original title of a novella written by the Scottish author Robert Louis Stevenson that was first published in 1886. The original pronunciation of Jekyll was "Jeekul" which was the pronunciation used in Stevenson's native Scotland. The work is commonly known today as The Strange Case of Dr Jekyll and Mr Hyde or simply Dr Jekyll and Mr Hyde. It is about a London lawyer named Gabriel John Utterson who investigates strange occurrences between his old friend, Dr Henry Jekyll, and the misanthropic Edward Hyde. The work is commonly associated with the rare mental condition often spuriously called "split personality", wherein within the same person there are at least two distinct personalities. In this case, the two personalities in Dr Jekyll are apparently good and evil, with completely opposite levels of morality. The novella's impact is such that it has become a part of the language, with the phrase "Jekyll and Hyde" coming to mean a person who is vastly different in moral character from one situation to the next. Strange Case of Dr Jekyll and Mr Hyde was an immediate success and is one of Stevenson's best-selling works. Stage adaptations began in Boston and London within a year of its publication and it has gone on to inspire scores of major film and stage performances. Robert Louis Balfour Stevenson (13 November 1850 – 3 December 1894) was a Scottish novelist, poet, essayist and travel writer. His best-known books include Treasure Island, Kidnapped, and Strange Case of Dr Jekyll and Mr Hyde. A literary celebrity during his lifetime, Stevenson now ranks among the 30 most translated authors in the world, just below Charles Dickens. He has been greatly admired by many authors, including Jorge Luis Borges, Ernest Hemingway, Rudyard Kipling, Marcel Schwob, Vladimir Nabokov, J. M. Barrie, and G. K. Chesterton, who said of him that he "seemed to pick the right word up on the point of his pen, like a man playing spillikins."

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