Dr. Ren is Vice director of the Radiology Department of the First Hospital of China Medical University.He is a radiological professor, chief physician and doctoral supervisor.He is a standing committee member of Cancer Imaging Specialized Committee of China Anti-cancer Association, deputy director of Cancer Imaging Specialized Committee of Liaoning Anti-Cancer Association, a member of the Chinese Medical Doctor Association Radiological Society, deputy head of Comparative Medicine Group, the standing member of the Standing Committee of the association of physicians of Liaoning Province , vice chairman of the fourteenth Contrast Agent Safety Work Committee,and the standing committee member of the Abdomen Department of the Liaoning Provincial Association of Physicians. He is also a reviewer of China Science and Technology Department, and a reviewer of China Education Ministry's degree center.