Heidi Grant Halvorson is Associate Director of the Motivation Science Center at the Columbia Business School. She is co-author (with E. Tory Higgins) of Focus: Use Different Ways of Seeing the World for Success and Influence. In this interview, we talk about the two different motivational focuses people can have on the world, how it affects their behavior, and how mastering these two perspectives can make you a better teammate, leader and even spouse.