Doug Jenkins is a Civil Engineering consultant based in Sydney Australia (Interactive Design Services Pty Ltd). He joined ExcelCalcs on 2008-06-23. His experience spans some thirty years and he has been involved with prestigious projects around the world. Doug has developed some very powerful Excel functions. Doug appears to prefer development of functions rather than calculations on the spreadsheet itself. If you have never written any macros in Excel his calculations serve as excellent examples you can easily follow. Doug also writes an great Excel Blog called www.newtonexcelbach.wordpress.com.