Adam Hargreaves (born June 18, 1963), is an English author and illustrator best known for being the son of the late Roger Hargreaves, creator of the Mr. Men book series, continuing his late father’s successful book series. Adam reportedly served as inspiration for the series, when at 8 years old, he asked his father "what does a tickle look like?" his father was inspired by the question and drew what would become the first book of the series, Mr. Tickle, published in August 1971.