Robin Lorraine LaFevers is an acclaimed American children's book writer from California. She is widely recognized for her Theodosia series (illustrated by Yoko Tanaka) and the Nathaniel Fludd, Beastologist series (illustrated by Kelly Murphy) for children. Additionally, she is the author of the His Fair Assassin series for young adults, which has been celebrated for its compelling storytelling.

LaFevers is a New York Times bestselling author with the critically acclaimed His Fair Assassin trilogy—Grave Mercy, Dark Triumph, and Mortal Heart—alongside the companion duology Courting Darkness and Igniting Darkness. Her books have garnered multiple starred reviews and have been selected as best books of the year by Booklist, Publishers Weekly, and Kirkus Reviews. They have also been nominated for the Mythopoeic Fantasy Award for Children’s Literature.

Writing as R.L. LaFevers, she brings to life the Theodosia and Nathaniel Fludd, Beastologist series. Despite never training as an assassin or joining a convent, Robin has been in search of answers to life’s mysteries for as long as she can remember, finding them mostly in books.