Just Stupid!

Andy Griffiths
Born	(1961-09-03) 3 September 1961 (age 55) Melbourne, Australia
Occupation	Author
Genre	Humour
Website
www.andygriffiths.com.au

Andrew Noel "Andy" Griffiths (born 3 September 1961) is an Australian children's book author and comedy writer. He is most notable for his Just! series, which was adapted into an animated television series called What's with Andy? Previously a vocalist with 1980s alternative rock bands Gothic Farmyard and Ivory Coast, in 1992 he turned to writing. He is well known for working with Terry Denton

All information correct"except for the 78-story treehouse being above the treehouse fun book

...
Wikipedia