Sarah Lynn's three young sons taught her how to race toy cars. Together they've used their imaginations to create roads everywhere (couch, kitchen floor, dirt, sand, rug, and the bathtub, just for starters.) The idea for 1-2-3 Va-Va-Vroom! came to Sarah when she was teaching her oldest son to write numbers. They began imagining the pencil as a car drawing its own track. Those vroom-vroom sounds made writing numbers so much more fun. Sarah is also the author of Tip-Tap Pop, illustrated by Valeria Docampo. She lives with her family in Camarillo, California. Visit her online at www.sarahlynnbooks.com.

Daniel Griffo became a self-taught comic illustrator in his teens and worked for both Argentinean and Italian publishers. He went on to create licensed artwork for various studios, which sharpened his skills. As a freelance illustrator, Daniel has worked for many large companies including Image Comics, Warner Bros. Entertainment, DC Comics, and Disney. Daniel's most recent children's book is Hello, Bicycle!, written by Ella Boyd. He lives in La Plata, Argentina, with his wife, Elba; his son, Benjamin; and their two pets, Indiana and Jones.