Brené Brown - The Power of Vulnerability
Julie Zhuo, The Making of a Manager: What to Do When Everyone Looks to You
Patrick Lencioni, The Five Dysfunctions of a Team: A Leadership Fable
Daniel Goleman, Emotional Intelligence
Fermat’s Last Theorem, Simon Singh
Freakonomics - Steve Dubner
Professor Alan Norbury, Chief Technologist, Siemens
Richard Potter, Director of Digital Strategy, Microsoft
Scaling Up, by Verne Harnish
Better Managers = Better Business, by Pete Fullard
McKinsey Quarterly (a wide range of leadership, management and strategic thinking)
Harvard Business Review (a wide range of leadership thinking)
David Clutterbuck (a good resource for coaching and mentoring thinking)
Nick Howell: Great Coaching Questions
Julie Starr: The Coaching Manual