Dr. Sun is a vitreoretinal surgeon and Chief of the Center for Clinical Eye Research and Trials of the Beetham Eye Institute, Joslin Diabetes Center. She is an Associate Professor of Ophthalmology at Harvard Medical School. She also serves as the Chair for the Diabetic Retinopathy Clinical Research Network (DRCR.net) and has chaired multiple nationwide, multicenter studies addressing new treatments and methods of evaluation for diabetic eye disease. Her research projects include the search for biomarkers of functional and anatomic outcomes in diabetic retinopathy and diabetic macular edema through utilization of advanced retinal imaging techniques.