Rob Collie is a former engineering leader at Microsoft, where he helped develop PowerPivot during his 14-year career with the company. He is the former chief technology officer at Pivotstream LLC and is the creator of PowerPivotPro.com, the world's leading PowerPivot website. He regularly consults and trains businesses and individuals on making the most of PowerPivot. He lives in Cleveland Heights, Ohio. Miguel Escobar is a consultant and expert on business intelligence, PowerPivot, Excel, Power View, and SharePoint.