Heidi Grant Halvorson studies motivation and communication. She is a social psychologist who has written 4 best-selling books, and regularly contributes to the Harvard Business Review, Wall Street Journal, and other popular periodicals in addition to scientific journals. The science of motivation, her primary field of research, is widely applicable as Halvorson’s work has helped explain why people struggle to diet, exercise, advance in the workplace, or take care of their personal relationships.