# Delroy Paulhus Canadian personality psychologist who, with [[Kevin Williams]], introduced the **[[Dark Triad]]** (narcissism, Machiavellianism, psychopathy) in a 2002 paper, and later helped extend it to the "Dark Tetrad" by adding everyday sadism. His work supplies the empirical, trait-measurement backbone for the vault's interest in the personality profile of exploitative actors. > [!note] Stub > Minimum-viable page created to resolve inbound wikilinks. Expand with the 2002 Dark Triad paper and the sub-clinical measurement approach.