In the late 1990s, bestselling-authors Marcus Buckingham and Curt Coffman partnered with Gallup to figure out what makes great managers great. Twenty-five years of cumulative data and more than 80,000 manager interviews later, they found that while great managers differed in everything from rank to gender, age, race, location and more, they also had a common thread: Every single one excelled at transforming employee talent into employee performance.
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