'Even though popular images of power center on a solitary heroic figure at the top, the reality of power at the top is increasingly different. Power is often shared among a small group of co-leaders (think CEO-COO, co-CEOs, CEO-Chairman, etc). Alvarez and Svejenova are pioneers in tackling this understudied leadership phenomenon. This book helps us understand shared leadership at the top both theoretically and practically. It is a must read for scholars interested in leadership and for practitioners who understand the necessity and difficulty of creating effective shared leadership.' Nitin Nohria, Harvard Business School