In Vietnam, Dr. Hoang Van Ke is regarded as a pioneer for his work in the area of medication assisted treatment (MAT) for individuals with opioid use disorders. In 2008, as the Vice Chairman of the Hai Phong Province Peoples Committee, he led the initiative to demonstrate that a Methadone Clinic pilot program could be established and effective in treating individuals in need of medication assisted therapies. During this period, only six clinics were piloting MAT in Vietnam. His continuing efforts have led to expansion of the use of methadone with now over 250 clinics throughout Vietnam, serving more than 45,000 patients. Dr. Ke has collaborated with the MARS Training Institute to pilot recovery support services for patients and staff in Hai Phong. He has facilitated systems change to bring methadone patients and addicts in recovery into health care facilities and community activities in order to reduce stigma. This transformation of the drug treatment system has resulted in community-based, voluntary treatment services where none previously existed for individuals with substance use disorders.