Simon's favourite writer is Anthony Trollope After she had her son Joshua in 1989, she started to write children's books full-time. Simon is one of the UK's best-selling children's writers; she has published over 50 different books, including the immensely popular Horrid Henry series, which has now sold over eighteen million copies. Simon won the Children’s Book of the Year in 2008 at the British Book Awards for Horrid Henry and the Abominable Snowman. The Horrid Henry series is published in 24 countries.
She lives in London with her husband Martin, son Joshua. Their Tibetan spaniel, Shanti died in Autumn 2013, but is memorialized in the short story Shanti that Wilson wrote for inclusion in the Paws and Whiskers anthology by fellow author Jacqueline Wilson published in February 2014.
^Francesca Simon (13 February 2014). "Supporting Battersea Cats and Dogs Home". www.francescasimon.com. Retrieved 2014-06-10. "Published today is Paws and Whiskers a special anthology of the very best stories about cats and dogs from the world of children’s literature, chosen by my fellow author, and Battersea Cats and Dogs Home patron Jacqueline Wilson. This book is very special to me because it includes a piece about Shanti, my wonderful Tibetan spaniel, who very sadly died last autumn. That’s Shanti on the cover, in the bottom right hand corner!"