Quick, clean, and to the point

Jon Peltier

Jon Peltier runs the popular Excel charting site PeltierTech.com, and is the developer of the Peltier Tech Chart Utility, which provides new chart types and charting utilities to Excel. PeltierTech features excellent in-depth charting tutorials that provide instructions on overcoming many charting problems, some of which seem insurmountable at first glance.  For examples, see Clustered and Stacked Column and Bar Charts or Excel Waterfall Charts (Bridge Charts). Jon also maintains an active blog where he covers a wide range of Excel-related topics.