Cassandra Clare was born to American parents in Teheran, Iran and spent much of her childhood travelling the world with her family, including one trek through the Himalayas as a toddler where she spent a month living in her father's backpack. She lived in France, England and Switzerland before she was ten years old. Since her family moved around so much she found familiarity in books and went everywhere with a book under her arm. She spent her high school years in Los Angeles where she used to write stories to amuse her classmates, including an epic novel called The Beautiful Cassandra based on the eponymous Jane Austen short story (and from which she later took her current pen name).
After college, Cassie lived in Los Angeles and New York where she worked at various entertainment magazines and even some rather suspect tabloids where she reported on Brad and Angelina's world travels and Britney Spears' wardrobe malfunctions. She started working on her young adult novel, City of Bones, in 2004, inspired by the urban landscape of Manhattan, her favourite city. She turned to writing fantasy fiction full time in 2006 and hopes never to have to write about Paris Hilton again.