We speak with Dr. Dominic Packer, Professor of Psychology at Lehigh University on a new book he co-authored called “The Power of Us – Harnessing our shared identities for personal and collective success” as well as: - The definition of “social identities,” and how they influence your behavior - One big factor that is driving political polarization - How to practice “transformational leadership” - Why understanding social identities is a critical part of tackling the big challenges that humanity faces like inequality, climate change and threat to democracy.