Cassandra Clare was born to American parents in Tehran. As a child Clare traveled frequently, spending time in Switzerland, England, and France. Clare returned to Los Angeles for high school, and from then on split her time between California and New York, where she worked at various entertainment magazines and tabloids including The Hollywood Reporter.
In 2004, Clare started working on her first-published novel City of Bones, inspired by the urban landscape of Manhattan. City of Bones was released by Simon & Schuster in 2007.
City of Bones, a contemporary fantasy story revolving around characters Clary Fray, Jace Wayland, and Simon Lewis became a New York Times bestseller upon its release. City of Ashes and City of Glass completed the trilogy. In 2009, a fourth installment, City of Fallen Angels was announced.
Clare has stated that City of Fallen Angels is actually the start of a second Mortal Instruments cycle, which will include two other books named 'City of Lost Souls' and 'City of Heavenly Fire'. She said this new cycle is going to be focusing on the same characters as in the first 'cycle', as well as a few new characters we will meet in the new books.
In 2009 Clare also announced a new series of prequels called The Infernal Devices set in the same universe as The Mortal Instruments, but in the Victorian era. This series is planned to consist of three books: The Clockwork Angel, scheduled to be published August 31, 2010, with The Clockwork Prince, expected to be published September 2011, and The Clockwork Princess, slated for release in September 2012.
The Mortal Instruments series has been optioned for film by Unique Features and Constantin Films. First-time writer Jessica Postigo has been hired to write the screenplay, based on the first three novels of the series.