Eileen Rosenthal and her husband, Marc Rosenthal, enjoy working together (and even sharing)—unlike Willy and Earl. I Must Have Bobo! was their first collaborative project and Eileen’s picture book debut. Marc is also the illustrator of Alison McGhee’s Making a Friend. Eileen and Marc live with their family in the Berkshires.

Marc Rosenthal is the New York Times bestselling illustrator of many books for children, including Small Walt by Elizabeth Verdick; I Must Have Bobo, I’ll Save You Bobo, and Bobo the Sailor Man, all by Eileen Rosenthal; The Straight Line Wonder by Mem Fox; and Phooey, which he wrote. Marc’s illustrations can be seen regularly in The New Yorker, Time, Forbes, Fortune, The Atlantic, The New York Times, The Boston Globe, The Washington Post, and others. Visit him online at Marc-Rosenthal.com.