Hallvard Lillehammer

contemporaryAnalytic Philosophy

Hallvard Lillehammer is a Norwegian-British philosopher at Birkbeck, University of London, specializing in metaethics, moral epistemology, and practical philosophy. He is known for contributions to debates on moral relativism, the Frege-Geach embedding problem, and the relationship between practical reason and moral psychology. His work engages critically with expressivist and non-cognitivist accounts of moral language.

Notable Achievements

Advanced debate on the Frege-Geach problem and the semantics of moral language in unasserted contexts

Developed influential work on moral relativism and companions-in-guilt arguments

Contributed to moral epistemology, particularly the status of moral intuitions and disagreement

Authored Companions in Guilt (2007), examining arguments from analogy in metaethics

Edited and contributed to philosophy of practical reason and the structure of agency

Positions & Arguments(1)

Philosophy of Language

claim

Any theory that explains 'good' as an optative in unasserted contexts would render obviously valid arguments invalid by treating them as equivocal