Anna Suk-Fong Lok is a gastroenterologist who studied in Hong Kong and moved to the United States in 1992. She is a Professor of Medicine at the University of Michigan in Ann Arbor and helped the World Health Organization (WHO) and American Association for the Study of Liver Diseases (AASLD) develop guidelines for medical professionals and recommendations for the general public on who should be treated and how treatments should be administered to persons with hepatitis B infections.