Celia is the daughter of a Mexican mother and a Cuban father.  Her debut book for young readers, The First Rule of Punk, was a 2018 Pure Belpré Award Honor Book, a 2018 Boston Globe-Horn Book Awards honor book, a winner of the 2018 Tomás Rivera Mexican American Children's Book Award, a Junior Library Guild selection, and was included in several best of the year lists including the Amelia Bloomer List, NPR's Best Books of 2017, the Chicago Public Library's Best of the Best Books, the New York Public Library's Best Books for Kids, School Library Journal's Best of 2017, The Horn Book Magazine's Fanfare, and ALSC's Notable Children's Books.

Things Celia loves in no particular order include: reading, revising, coffee, Halloween, snail mail, finding original Cutler mail chutes in old hotels, gray days, pitbulls, baking, podcasts, music, zines, handmade gifts, and trying to minimize her carbon footprint.

Originally from Miami, Florida, she now lives in Chicago with her family. In addition to writing for young readers, she is a community college librarian.