Demi was born in Cambridge, Mass. She studied at the Instituto Allende in Guanajuato, Mexico, at Immaculate Heart College with Sisters Magdalen Mary and Sister Corita in Hollywood, California. She also studied at the M.S. University in Baroda, India, while on a Fulbright Scholarship, as well as the China Institute For Arts in New York City.
Her husband Tze-si Huang introduced her to the religion, folklore, ancient culture, and history of China.
Demi has illustrated and authored more than 300 children's books including biographies of Jesus, Buddha, and the Dalai Lama, as well as folktales such as The Empty Pot and Liang and the Magic Paintbrush. Her work has received many awards and accolades, among them the Christopher Award, which recognizes individuals whose work makes a positive difference in the world, and the Middle
East Book Award. Her titles have been designated American Library Association Notable Children's Books, New York Times Best Illustrated Books, Notable Books for a Global Society, and American Bookseller Pick of the List Books.