Cate Tiernan is the pen name of Gabrielle Charbonnet, an American author born on July 24, 1961. Writing under this alias, she has become widely recognized for her Sweep series, which delves into the Wiccan adventures of a group of high school students. The series is marketed under different names across the globe: as the Wicca series in the UK, Belgium, The Netherlands, and Australia, and as White Magic (Magie Blanche) in Italy and France.

Aside from her work as Cate Tiernan, under her own name, Gabrielle Charbonnet is known for her contributions to children's literature, including the Princess, American Gold Gymnasts, and Disney Girls series. Her collaboration with James Patterson in 2008 and 2009 on the young adult novels Sundays at Tiffany's and Witch & Wizard further showcases her versatility as a writer.

Originally from New Orleans, LA, Tiernan's upbringing in one of America's most unique cities deeply influenced her writing. The rich and exotic culture of New Orleans, known for its vibrant gardens, relentless heat, and acceptance of eccentric behavior, provided a fertile ground for her imagination. After completing her education in New York, she returned to the publishing world in Manhattan where she embarked on her writing career.