Adam Hargreaves (Author, Illustrator) Adam Hargreaves is an English author and illustrator. The son of Roger Hargreaves, he continues his father's popular Mr. Men and Little Miss series of children's books.Roger Hargreaves is best remembered as the creator, author and illustrator of the Mr. Men and Little Miss series of books as well as Albert the Alphabetical Elephant, Count Worm, and Grandfather Clock.