A. Conan Doyle
A. Conan Doyle  was a Scottish author who, initially, was the uncredited creator of the Sherlock Holmes characters that first appeared in the TNG Season 2 episode . 

Although the setting had proven popular among the staff, further use of the character on The Next Generation was prevented by a protracted legal dispute between Paramount and the estate of Arthur Conan Doyle.  came about when Jeri Taylor decided to re-investigate the possibility, only to find that the whole situation was a misunderstanding. The Conan Doyle estate had been irritated at Paramount because of the film . However, by the time this episode was conceived, they were willing to license the character for what Taylor described as a "very reasonable license fee". Actor Brent Spiner was particularly thrilled, as he had wanted to play Holmes again. (; Captains' Logs: The Unauthorized Complete Trek Voyages, p. 269) 

Doyle was then, rightfully, credited in the end credits of the TNG Season 6 episode "Ship in a Bottle", following the arrangement made in association with his daughter, Dame Jean Conan Doyle. 

 director and screenplay writer Nicholas Meyer had previously written the screenplay for The Seven-Per-Cent Solution, based on his novel. The film and book feature Sherlock Holmes, Arthur Conan Doyle's creation. This may be the reason that Spock implies that he is a descendant of Doyle's through his mother Amanda Grayson.

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