Doreen Cronin is the author of many bestselling and New York Times bestselling picture books, including Click, Clack, Quack to School! ; Click, Clack, Surprise! ; Click, Clack, Ho, Ho, Ho ; Click, Clack, Peep ; Click, Clack, Boo! ; Dooby Dooby Moo ; Thump, Quack, Moo: A Whacky Adventure ; Bounce ; Wiggle ; Duck for President ; Giggle, Giggle, Quack ; Bloom ; and the Caldecott Honor Book Click, Clack, Moo: Cows That Type as well as The Chicken Squad series and Cyclone . She lives in Brooklyn, New York. Visit her at DoreenCronin.com. Betsy Lewin is the Caldecott Honor-winning illustrator of Click, Clack, Moo: Cows That Type and its sequels, including Click, Clack, Quack to School! ; Click, Clack, Ho, Ho, Ho ; Click, Clack, Peep ; Click, Clack, Boo! ; Giggle, Giggle, Quack ; Duck for President ; Dooby Dooby Moo ; and Thump, Quack, Moo ; in addition to a number of other picture books, including So, What's It Like to Be a Cat? and Where Is Tippy Toes? . She lives in Brooklyn, New York.