Supreme Master (or "Suma") Ching Hai, (born 12 May 1950), is the spiritual teacher of the Quan Yin Method with an estimated 20,000 followers worldwide.Ching Hai is a self-published writer and entrepreneur who heads the Supreme Master Ching Hai International Association, a business group with worldwide interests in restaurants, fashion and jewelry design. She has been criticised for making allegedly ostentatious displays of generosity as well as self-promotion.