Oliver Peter Martin John (born February 9, 1959) is a German personality psychologist and professor of psychology at the

University of California, Berkeley The University of California, Berkeley (UC Berkeley, Berkeley, Cal, or California) is a public land-grant research university in Berkeley, California. Established in 1868 as the University of California, it is the state's first land-grant u ...

. He is known for co-developing the 1998

Big Five Inventory The Big Five personality traits is a suggested taxonomy, or grouping, for personality traits, developed from the 1980s onward in psychological trait theory. Starting in the 1990s, the theory identified five factors by labels, for the US English ...

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Faculty page
* Living people Personality psychologists 21st-century American psychologists 1959 births University of California, Berkeley College of Letters and Science faculty University of Oregon alumni 20th-century American psychologists {{US-psychologist-stub