Maribeth Boelts has written many picture books, including "Those Shoes, " which was a Charlotte Zolotow Award Honor book. "The PS Brothers" is her first novel. She lives in Cedar Falls, Iowa. www.maribethboelts.com
Lauren Castillo has illustrated many picture books and has also written and illustrated several, including The Troublemaker and Nana in the City. She lives in Brooklyn, New York, and you can also find her at www.laurencastillo.blogspot.com and follow her on Twitter @studiocastillo.