“The people you spend time with literally co-create who you are, down to the near-cellular level. You’re building a life. The ones you build it with will be critical to your professional success, not because they’ll be in your field, but because they’ll be in your corner. The good ones will give you a kind of emotional buoyancy and a head-shrinking perspective that will nourish the person you’re trying to become—and yeah, that’ll enhance your job performance immeasurably.”