How long has Jeff Kinney been writing children's books?

11. He is the author of the Diary of a Wimpy Kit Series

1. Diary of a Wimpy Kid
2. DIary of a Wimpy Kid: Rodrick Rules
3. DIary of a Wimpy Kid: The Last Straw
4. Diary of a Wimpy Kid: Dog Days
5. Diary of a Wimpy Kid: The Ugly Truth
6. Diary of a Wimpy Kid: Cabin Fever
7. Diary of a Wimpy Kid: The Third Wheel
8. Diary of a Wimpy Kid: Hard Luck
9. Diary of a Wimpy Kid: The Long Haul
10. The Wimpy Kid Movie Diary
11. The Wimpy Kid Do it Yourself book