His Kieu Hoang Winery is located in Napa Valley, California. In March 2017, Hoang Kieu donated $5 million to help the victims of a massive flood in San Jose, California. He was initially planning to donate just $2 million, but soon upped his gift after learning more about the devastation experienced. It is the largest private donation ever made to the people of San Jose. Hoang Kieu is very active in philanthropy through his charity Friends of Hue Foundation. The foundation does a lot of work with the Vietnamese community because Hoang himself is a Vietnamese refugee.