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Growing up, Cassie Waters spent every waking moment of every summer at her swim club (which was conveniently located at the end of her street). These days, Cassie lives in the suburbs of New Jersey, writing and editing books, hanging out with friends, and having lots of fun. Over the years, Cassie has written dozens of books, but the Pool Girls series is nearest and dearest to her heart. She doesn't make it to the pool nearly as often as she would like these days, but she is still very good friends with the girls she used to hang out with at her swim club.

Renée Kurilla is an illustrator of many books for kids, including Orangutanka: A Story in Poems by Margarita Engle, The Owls of Blossom Wood by Catherine Coe, and the Ada Lace Adventure series by Emily Calandrelli. She lives just south of Boston with her husband, their fluffy orange cat, Timmy, and their spiky hedgehog, Lemon. Visit her at Kurillastration.com.