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To answer your specific question about Seanan/Mira, see http://seananmcguire.com/writefaq.php#mira. In her case, she's using different names for urban fantasy vs science fiction. There's also the ...
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Source: https://writers.stackexchange.com/a/4274 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
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To answer your specific question about Seanan/Mira, see [http://seananmcguire.com/writefaq.php#mira](http://seananmcguire.com/writefaq.php#mira). In her case, she's using different names for urban fantasy vs science fiction. There's also the classic midlist death spiral--author doesn't sell enough, publisher drops them, author changes name so they can sell new books.