Strengths Based Leadership: Great Leaders, Teams, and Why People Follow, Tom RathFrom Gallup: a landmark study of great leaders, teams and the reasons why people follow. More than a decade ago, Gallup unveiled the results of a landmark 30 year research project that ignited a global conversation on the topic of strengths. Since then, more than 23 million people have taken Gallups CliftonStrengths (formerly StrengthsFinder) assessment, which forms the core of several books on this topic, including the #1 international bestseller