Yien is a Maryland-qualified handgun instructor and NRA-certified instructor. He is currently certified to teach NRA basic and advanced courses. Yien grew up in Singapore, where citizen training in firearms is valued. He became a firearms instructor to help encourage safe, responsible gun ownership among Asians and other minorities. His courses emphasize gun safety and help new shooters acquire the skills and confidence to use a firearm for defense and prepare for more advanced training. He offers classes in English and Mandarin.