All publications I know of:

 

• Which Consequentialism? Machine Ethics and Moral Divergence (2009) - w/ Henrik Jonsson & Nick Tarleton
• Machine Ethics and Superintelligence (2009) - w/ Henrik Jonsson & Nick Tarleton
• Omohundro's Basic AI Drives and Catastrophic Risks (2010)
• Implications of a Software-Limited Singularity (2010) - w/ Anders Sandberg
• Superintelligence Does Not Imply Benevolence (2010) - w/ Joshua Fox
• Whole Brain Emulation and the Evolution of Superorganisms (2010)
• Arms Races and Intelligence Explosions (forthcoming) - w/ Stuart Armstrong
• How Hard is Intelligence? The Evolutionary Argument and Observation Selection Effects (forthcoming) - w/ Nick Bostrom