Mercer Mayer is an American author and illustrator of children's books. He is best known for his Little Critter series, which has sold over 200 million copies worldwide. Mayer has written and illustrated over 300 books, including the popular There's a Nightmare in My Closet and Just Me and My Dad. He has also written and illustrated books for other authors, including the popular I Can Read series. Mayer has won numerous awards for his work, including the Children's Choice Award and the National Parenting Publications Award. He has also been inducted into the Society of Illustrators Hall of Fame. Mayer continues to write and illustrate books for children, inspiring them to explore their imaginations and discover the joy of reading.