Courtney Summers is a Canadian writer of young adult fiction known for her powerful depictions of complex and difficult themes. She was born in 1986 in Belleville, Ontario, Canada. Summers gained wide recognition with her novels such as Cracked Up to Be, This is Not a Test, All the Rage, and Sadie. Her book Sadie was particularly successful, making its mark on over 30 'Best of' lists and being published in 26 territories.

Summers has been celebrated for her storytelling prowess, especially in crafting stories about 'angry and unlikable girls,' with Electric Literature hailing her as "a master of the bitch" in 2018. She has received critical acclaim and numerous accolades for her work, including the prestigious Edgar Award and the Odyssey Award. Outside her novels, Courtney has contributed reviews to The New York Times and initiated the 2015 worldwide trending hashtag #ToTheGirls, encouraging the empowerment of young women.

She continues her literary career in Canada where she lives and writes. Summers is also known for engaging with her readers through social media platforms like Instagram and her newsletter.