Jonas Olson is a contemporary Swedish philosopher based at Stockholm University, specializing in metaethics and moral philosophy. He is best known for defending and developing moral error theory in the tradition of J.L. Mackie, arguing that moral discourse involves systematic false presuppositions about the existence of objective moral facts. His work engages seriously with both naturalistic and non-naturalistic forms of moral realism before rejecting them.
Authored 'Moral Anti-Realism' (2014, OUP), a systematic defense of moral error theory
Developed influential arguments against robust moral realism, including non-naturalist versions
Contributed to debates on the queerness argument and companions-in-guilt strategies in metaethics
Advanced analysis of the relationship between normative and descriptive properties in ethical naturalism
Published widely on moral ontology, the nature of moral properties, and metaethical methodology