nytimes May 21, 2021 8:01pm Jerome Kagan, Who Tied Temperament to Biology, Dies at 92 #psychologyandpsychologists #deathsobituaries #harvarduniversity #kaganjerome #childrenandchildhood #parenting #biologyandbiochemistry #science #news Jerome Kagan, Who Tied Temperament to Biology, Dies at 92 A Harvard psychologist, he originally attributed personality traits to nurturing only. Then he concluded, We’re largely born this way.