Cara Natterson, MD, is a pediatrician, popular speaker, consultant, and New York Times bestselling author of multiple parenting and health books, including The Care and Keeping of You, a three-book series with more than six million copies in print, and Guy Stuff, the corollary for boys. A graduate of Harvard College and Johns Hopkins Medical School, Natterson trained in pediatrics at University of California at San Francisco.

The founder of Worry Proof Consulting, a first-of-its-kind practice offering parents open-ended time to discuss the topics that doctors don't have time for, she is also the Chair of the Board of Starlight Children's Foundation, and is on the Medical Board of Advisors for The Honest Company. Dr. Natterson is also an online expert at momlogic, parentsask, and gurumommy. She lives in Los Angeles with her husband, son, and daughter.

Micah Player is the picture book author-illustrator of Chloe, Instead and the Lately Lily series, and the creator of the bestselling Around the World Puzzle and its follow-up, Around the World Matching Game.

Born in Alaska, Micah now lives in Utah with his wife, Stephanie, and their two kids.