Frances Frei, professor at Harvard Business School, says that trust, empathy - and even a bit of tough love - are all essential ingredients to strong leadership in today's world. Successful managers focus on the effect they have on others, not themselves. They also define a strategy and create a culture that drives employee behavior in their absence. Frei is the coauthor, along with Anne Morriss, of the book "Unleashed: The Unapologetic Leader’s Guide to Empowering Everyone Around You" as well as the HBR article “Begin with Trust.”