Harvard Business School social psychologist Amy Cuddy has empowered viewers around the world with her TED Talk about the science of “power posing”—the second most viewed talk in TED’s history, with over 27 million views and counting.

In her first book, Presence: Bringing Your Boldest Self to Your Biggest Challenges, Dr. Cuddy explains the science underlying power poses and many other fascinating body-mind effects, and teaches us how to use this science to become self-assured in life’s most challenging moments—job interviews, difficult conversations, speaking up for ourselves and more.

Cuddy shows us we need to stop worrying about the impression we’re making on others, and instead change the impression we’re making on ourselves. Cutting-edge science reveals that if we adopt behaviors reflecting power and strength, we liberate ourselves from the fears and doubts that obstruct us. By redirecting our thoughts, actions, and even physiology, we change not only our minds but also our biology, and free ourselves to be our best.

Cuddy has been named a Game Changer by Time, one of 50 Women Who Are Changing the World by Business Insider, and a Young Global Leader by the World Economic Forum.

In conversation with Guy Raz, the host and editorial director of TED Radio Hour, a co-production of NPR and TED. Book signing to follow.