Dr. Üstün has worked in WHO since 1990 first in Mental Health, then in Evidence Cluster as an international health officer and formed multiple international networks on Classification and Assessment of Health and Disability; Mental Health Epidemiology, and Primary Care applications of classification and training programmes.

He has conducted large scale epidemiological surveys such as the Psychological Problems in General Health Care (1990-1998) ; World Mental Health Surveys ( 1998- 2006) and World Health Surveys ( 1999-2003).

Currently he is responsible for the WHO’s Family of International Classifications (ICD, ICF and other health classifications); development of standardized health terminologies; and compilation of health information standards.

Dr. Üstün is the author and co-author of more than 150 articles, several books on psychiatry, primary care, classifications and health assessment.

Specialties: Classifications, Health Terminologies, Health Information Standards, Health Epidemiology, Disability, Health Assessment, Mental Health, Surveys