David's father taught him that you should never throw away anything until you have taken it apart to see how it worked and why it stopped working. David attended night classes in electronics technology and machine design at Purdue University while working days at International Harvester's Motor Truck Division. His job was to design machines to test the reliability of components used in their production, make improvements, and then re-test the improvements. After retiring from a long career in engineering, he found that he missed being active in troubleshooting. The chance to help Bob on his electrical item repair team has given him a new and interesting opportunity to tear things apart, find out how they work, make repairs, and put them back together again.