Czekaj is a cartoonist, children s book author and illustrator, and underground DJ. His comic Grampa and Julie: Shark Hunters ran in Nickelodeon magazine for more than ten years. Jef s other picture books include Austin, Lost in America; Cat Secrets; Oink-a-Doodle-Moo; and Hip & Hop, Don t Stop! He lives in Somerville, Massachusetts. You can visit him online at www.czekaj.com.