In September, 2009, Sum became the number 2 book in the United Kingdom on Amazon's bestseller list, only behind Dan Brown's Lost Symbol.
Sum was the only book of fiction in New Scientist magazine's selection of Best Books of 2009.
Read David's Op-Ed piece in The New York Times regarding time and Obama's withdrawal plan.
A 26 week New York Times bestseller, Incognito was named a Best Book of the Year by both Amazon and Goodreads. For a taste of the book, see a review in the Wall Street Journal, listen to a conversation on NPR's Fresh Air, or watch a video dialog with Wired Magazine. Reading Incognito now? We'd love to hear feedback!