Heidi Grant Halvorson

Heidi Grant Halvorson, PhD, is a social psychologist and the associate director of Columbia University's Motivation Science Center. She is the author of three books, including Focus: Use different ways of seeing the world for success and influenceand a regular contributor to Harvard Business Review, WSJ.comand 99u.

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Life as an Obama Impersonator

"When you think you're the president, you just act like you are above everybody else."

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Things Not to Say to a Pregnant Woman

You don't have to tell her how big she is. You don't need to touch her belly.

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Maine's Underground Street Art

"Graffiti is the farthest thing from anarchy."

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The Joy of Running in a Beautiful Place

A love letter to California's Marin Headlands

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'I Didn't Even Know What I Was Going Through'

A 17-year-old describes his struggles with depression.

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