Dr. Si earned the B.A., D.D.S., and M.S.D. (pediatric dentistry) degrees at Emory University. Dr. Si is a member of the American Dental Association, the Georgia Dental Association, the Southeastern District Dental Society, the Savannah Dental Society, the American Academy of Pediatric Dentistry, the Southeastern Society of Pediatric Dentists, and the Georgia Society of Pediatric Dentistry. He is a Fellow of the American College of Dentists, the International College of Dentists, and the Pierre Fauchard Academy, and an honorable Fellow of the Georgia Dental Association. He has served as president of the Savannah Dental Society, the Southeastern Society of Pediatric Dentists, and Georgia Society of Dentistry for Children. Dr. Si and his wife, Suzanne, are members of The Independent Presbyterian Church.