He is a slight, bespectacled man. Colleagues at the industrial materials company where he works describe him as a humorous but diligent employee, known for driving his white Jeep around town in northwestern China's Ningxia region to meet potential clients.
Unbeknownst to them, he goes by Benjamin Chen online, where he has a whole other business: He is a popular seller of the chemicals used to make the potent synthetic opioid fentanyl. NPR has identified him but is not using his real name because of the illegal activity in which he's involved.