David has a wealth of knowledge and has been a great seminar partner with PerformerTrack. He's always available to answer questions our and our users. We've recommended him for almost a decade. Time files!
Here's a fun article of Gifts for Business that we collaborated on: http://www.holdonlog.com/pages/AN-TTT-0706.html and another on being a QPA: http://www.holdonlog.com/pages/AN-TTT-0306.html