David Klass is the author of many young adult novels, including Dark Angel and You Don’t Know Me. The Greenpeace organization made an unprecedented endorsement of his novel Firestorm for its impact of environmental education. Timelock, the third installment in his environmental trilogy, has just been published. He has also written a number of screenplays, including Kiss the Girls and Desperate Measures. His newest novel for adults, Out of Time, is forthcoming from Dutton. He lives in New York City with his wife and two children.