Sarah Monette and Katherine Addison are the same person.
She grew up in Oak Ridge, Tennessee, one of the three secret cities of the Manhattan Project. She got her B.A. from Case Western Reserve University, her M.A. and Ph.D. from the University of Wisconsin-Madison. Despite being summa cum laude, none of her degrees is of the slightest use to her in either her day job or her writing, which she feels is an object lesson for us all. She currently lives near Madison, Wisconsin.
She has published more than fifty short stories and has two short story collections out: The Bone Key (Prime Books 2007–with a shiny second edition in 2011) and Somewhere Beneath Those Waves (Prime Books, 2011). She has co-written three novels (and a number of short stories) with Elizabeth Bear, the last of which, An Apprentice to Elves, was published in October 2015. Her first four novels (Melusine, The Virtu, The Mirador, Corambis) were published by Ace. Her latest novel, The Goblin Emperor, published as Katherine Addison, came out from Tor in April 2014 and won the Locus Award for Best Fantasy Novel. She's on Twitter as @pennyvixen & also has a Patreon: https://www.patreon.com/pennyvixen.