Actively involved in trainee education, Dr. Yoon also serves as Fellowship Programs Leader for the Department of Ophthalmology and Fellowship Director for the ASOPRS Ophthalmic Plastic Surgery Fellowship. He has received accolades for his excellence in teaching, including the Best Teaching by a Clinical Fellow Award from the Cordes Eye Society.

While Dr. Yoon's clinical practice and teaching constitute the majority of his work at Mass Eye and Ear, he is also a productive clinical researcher. He is especially interested in studying ways to improve the diagnosis and treatment of orbital diseases, including that involve growths in the eye socket. He also investigates thyroid-related eye disease, which can cause changes in the eye socket that may lead to impaired vision, including double vision or vision loss.