About Margaret Peterson Haddix
Margaret Peterson Haddix is an American writer known best for the two children's series, Shadow Children (1998–2006) and The Missing (2008–2015). She also wrote the tenth volume in the multiple-author series The 39 Clues. Haddix experienced a long period of having her writing rejected by publishers before her first two books were accepted in 1995 and 1996. Haddix chose to pursue fiction writing after her husband, Doug, became a news reporter, because she did not want to be his employee.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.