3D Printing
16 years of professional repair work. There's no "certification" for this trade; the printers don't care about paperwork. I manage 3D Print Orlando, Florida's 3D printing source and the area's only professional 3D printer repair service — 5,203+ machines serviced and counting. I also built out our 3D scanning and full-color mini-print studio, where we take scanning rigs to events, scan people on the spot, and print full-color miniature replicas of them.
I founded and ran Google+'s 3D Printing community for about 7 years. When G+ shut down, it migrated to Maker Forums, where it still lives today. I also run workshops and mentor other makers at local hackerspaces.