Dr. Sun is a licensed Internal Medicine in CT. Graduated in 1983. Medical degree obtained from Shanghai, Fudan Univ. Shanghai Medical College in China. Completed residency training at Unity St Mary's Campus,. Currently practices at Pei Sun MD LLC (Pei Sun MD LLC), located at 850 N Main St, Wallingford, CT 06492. Dr. Sun specializes in internal medicine and primary care.. In addition to English, Dr. Sun speaks Mandarin.