JEAN MARZOLLO has written many award-winning children's books, including the I Spy books and Happy Birthday, Martin Luther King . Jean lives with her husband, Claudio, in New York State's Hudson Valley. WALTER WICK is best known for his brilliant search-and-find photographs, he is the co-creator and photographer of the I Spy books, as well as the author, creator, and photographer of the Can You See What I See? series. He is also the author and photographer of two award-winning science books, A Drop of Water: A Book of Science and Wonder and Walter Wick's Optical Tricks . He lives with his wife, Linda in Connecticut.