Greg is a science fiction writer and amateur mathematician, best known for his works of hard science fiction. He specialises in stories with mathematical and quantum ontology themes, including the nature of consciousness. His other themes include genetics, simulated reality, posthumanism, mind transfer, sexuality, artificial intelligence and the superiority of rational naturalism over religion. Greg has won multiple awards including the John W. Campbell Memorial Award, the Hugo Award, and the Locus Award.
Greg is an atheist and seems to have a firmly naturalistic worldview. He is vegan, implying a sentiocentric moral scope.