Brené Brown - The Power of Vulnerability
Simon Sinek - How Great Leaders Inspire Action
Julie Zhuo, The Making of a Manager: What to Do When Everyone Looks to You
Simon Sinek, Leaders Eat Last: Why Some Teams Pull Together and Others Don't
Patrick Lencioni, The Five Dysfunctions of a Team: A Leadership Fable
Daniel Goleman, Emotional Intelligence
Paul Sloane, The Leader’s Guide to Lateral Thinking Skills
Fermat’s Last Theorem, Simon Singh
The Lean Startup by Eric Ries
Freakonomics - Steve Dubner
Scaling Up, by Verne Harnish
Better Managers = Better Business, by Pete Fullard
McKinsey Quarterly (a wide range of leadership, management and strategic thinking)
David Clutterbuck (a good resource for coaching and mentoring thinking)
William Buist: Intentional Mastery