Holly Black is an American author known for her works in the fantasy genre, particularly for her contributions to young adult literature. Her most notable works include The Spiderwick Chronicles, a bestselling series co-written with Tony DiTerlizzi, and The Cruel Prince, the first book in her popular Folk of the Air trilogy. Black's writing is characterized by its dark and intricate world-building, complex characters, and exploration of themes such as power, betrayal, and morality. She has had a significant impact on the genre of urban fantasy and is praised for her ability to create immersive and compelling stories that resonate with readers of all ages.