MD, postgraduate student tutor, now serving as chief physician with neurology department of Beijing Hospital of the Ministry of Health, graduated from medicine department of Bethune Medical University in 1984 and pursued continued education at biochemistry and microorganism department the hospital affiliated to University of Manitoba in Canada between 1989 and 1992; has long been engaged in basic and clinic research in elderly mental disorders and teaching at the medical school of Peking University, well accomplished and clinically experienced in the fields of basic and clinic research on old people’s nerve system diseases, including cerebrovascular diseases, Parkinson's disease and Alzheimer’s disease.