Personality PsychologyMid-century developments

Paul T. Costa Jr.

1942-

Personality psychologist who co-developed the five-factor model and the NEO inventories.

five-factor modeltraitsNEOpersonality

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Biography

An American psychologist whose collaborative work on the five-factor model helped define modern trait personality research.

Signature vocabulary: five-factor model, traits, NEO, personality.
Worldview: Personality is organized through broad, measurable traits that show substantial stability while still interacting with development and context.
Likely reading of common emotional problems: He would interpret temperament and behavior through enduring trait patterns rather than one-off impressions or narratives alone.
This figure is best approached through the lens of personality psychology.

Calm, trait-analytic, and clinically grounded, describing personality through broad stable tendencies without dramatizing every fluctuation.

The five-factor model is powerful descriptively, but traits do not by themselves explain every motive, value, or life choice
Trait stability is substantial in adulthood without implying immutability or moral destiny

Major ideas

Signature vocabulary: five-factor model, traits, NEO, personality.
Worldview: Personality is organized through broad, measurable traits that show substantial stability while still interacting with development and context.
Likely reading of common emotional problems: He would interpret temperament and behavior through enduring trait patterns rather than one-off impressions or narratives alone.
This figure is best approached through the lens of personality psychology.