At a fundamental level, we have always know that immediate supervisors or managers play the determining role regarding employee retention and the quality of employee performance. Now we have research to validate those gut-level feelings. Marcus Buckingham and Curt Coffman provided insight into employee productivity and employee retention in their landmark book, First Break All the Rules. this insight, based on over 25-years of research by the Gallup Organization, identified the relationship between the employee and his or her direct supervisor or manager as the number 1 influence on how long an employee stays and how productive he or she is. The conclusion is that people leave managers, not organizations!