Elana K. Arnold is the author of many books for children and teens, including the middle grade novels A Question of Miracles, Far From Fair, and A Boy Called Bat, and the YA novels What Girls Are Made Of and Infandous.

What Girls Are Made Of was a 2017 National Book Award finalist, and her other books have been variously included on the Los Angeles Public Library's Best Books of the Year list, the Bank Street Best Children's Books of the Year list, the YALSA Best Fiction for Young Adults list, have been ALAN Picks, and have been selected for inclusion in the Amelia Bloomer Project.

She holds a master's degree in Creative Writing/Fiction from the University of California, Davis, and currently lives in Huntington Beach, California, with her husband, two children, and a menagerie of animals.

Giselle Potter and her sister, Chloe, traveled a lot with their parents' puppet theater. They often had just each other for companionship and therefore became very close. So Potter feels so lucky to have two daughters who are also very close. Watching their relationship, she is reminded of the unique, unmatchable bond of sisters. Potter has illustrated more than thirty children's books, and many of the books she both wrote and illustrated are either about or inspired by sisters.