Roger Hargreaves was born in 1935 in Cleckheaton, Yorkshire, England. He began his career as an author later in life, but first followed a career in advertising, and he became a creative director at a London advertising firm.
He married his wife Christine and they had four children - Adam, Giles and twin girls Sophie and Amelia.
As an author, his most famous creations were the Mr Men, with the first book, Mr Tickle, being written in 1971 after being asked by his son, 'What does a tickle look like?" In all he wrote and illustrated 43 Mr Men books.
The Little Miss series was not started until 1981, with books such as Little Miss Naughty and Little Miss Bossy. He wrote and illustrated 30 books in the Little Miss series.
During the 1970s and 80s he also wrote many other childrens books, such as the Timbucktoo and John Mouse series.
Roger Hargreaves died in 1988 aged 53.