Toni Buzzeo s first two books in the series, Whose Tools? and Whose Truck?, have sold more than fifty thousand copies. Toni is the author of the 2013 Caldecott Honor Book and New York Times bestseller One Cool Friend, as well as many other books for children.

A former elementary school librarian and secondary teacher, she now presents at schools, national and international library and reading conferences, and in district and regional staff development trainings. Buzzeo lives with her husband in Arlington, Massachusetts.

Ramon Olivera is the illustrator of several books for young readers, including ABCs on Wheels, which was praised in a starred review in Publishers Weekly: "Clean, crisp digital graphics...This one deserves a victory lap." His work has been exhibited in the New York Society of Illustrators and the Negro Leagues Baseball Museum. Ramon lives in Kansas City, Missouri, with his wife and two kids.