E. Joseph Billo, a former associate professor of chemistry at Boston College, is the author of Excel for Chemists: A Comprehensive Guide, Second Edition (Wiley). He has developed two short courses, "Advanced Excel for Scientists and Engineers" and "Excel Visual Basic Macros for Scientists and Engineers," which he has presented to thousands of scientists throughout the United States, Canada, and Europe for organizations such as The American Chemical Society, the National Cancer Institute, Procter & Gamble, Shell, and Texaco.