Sierra Greer

Real name: Caragh M. O'Brien

Sierra Greer is the pen name under which the American novelist Caragh M. O'Brien published Annie Bot. Born in Saint Paul, Minnesota, she earned a degree in physics at Williams College and an MA in the Writing Seminars at Johns Hopkins University. She taught high school English and published romance novels before writing full-time, and is best known under her own name for the Birthmarked trilogy of young adult dystopian novels, set in a world ruined by climate change, and the Vault of Dreamers trilogy. Annie Bot, her first novel as Sierra Greer and her first for adult readers, won the Clarke Award in 2025. She lives in rural Connecticut.

Timeline of Sierra Greer’s life

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Prizes