An author most known for his contributions to the science fiction genre, he published three novels based on the popular Halo video games. His other works include Signal to Noise, Crimson Skies, and Mortal Coils.
Prior to writing professionally, he graduated from the University of California-Santa Barbara with a degree in chemistry.
He was once hired by Microsoft to help with the editing of a multi-media encyclopedia.
He married fellow science fiction writer Syne Mitchell.
He and actress Gwyneth Paltrow both studied at the University of California-Santa Barbara.