He received his medical degree from the Wenzhou Medical College, China. He received a PhD in neurosciences and electrophysiology at the University of Kentucky. He completed his psychiatry residency training at Creedmoor Psychiatric Center, New York. He also has completed fellowships at the New Jersey Neuroscience Institute at JFK Medical Center (sleep medicine), Yale University (pharmacology) and Columbia University (ECT). Dr. Sun is licensed to practice in New Jersey.