(born February 15, 1934) is an American psychologist
and professor emeritus at the University of California, San Francisco
who is a pioneer in the study of emotion
s and their relation to facial expression
s. He was ranked 59th out of the 100 most cited psychologists of the twentieth century. Ekman conducted seminal research on the specific biological correlations of specific emotions, attempting to demonstrate the universality and discreteness of emotions in a Darwinian approach.
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