Andreas Christiansen works primarily on three related topics:
Democratic theory: Under which circumstances are political decisions democratically legitimate when there exist (politically motivated) disagreements concerning policy-relevant matters of fact?
Risk: When is it ethically acceptable to impose risks on people? How do experts’ and lay people’s risk perception (i.e. their beliefs about how serious different risks are) relate to ethical and political-philosophical theories of when risks are acceptable? What methods of analysis and decision-making should we use when regulating risk?
Genetic modification and food ethics: What ethical problems (if any) are there in genetically modifying plants, microorganisms and animals? Should we allow or even promote the use of genetic modification and other biotechnology in agriculture and food production? Should we prefer organic over conventional farming, or is there third alternative that is even better?