John Neffinger and Matthew Kohut, co-authors of Compelling People: The Hidden Qualities that Make Us Influential, have learned a lot about the impact of a smile, our posture, our gestures, and our tone of voice on the people around us. Their goal is to help others understand how to be more compelling, because being able to influence people, whether that’s getting your toddler to eat her carrots or getting your employees to meet your company’s objectives, is how we make things happen in the world.