Dr. Han is a neurologist working as president of Do Neurology Clinic and Do Balance Center. His major interests are headache, dizziness, tinnitus, sleep problems, and vestibular rehabilitation therapy. He has published several books and papers, including several SCI journals. The transcranial Doppler exam of Do Neurology Clinic was recognized as a national representative technique in 2010. He has made presentations and research posters regarding dizziness, tinnitus, and vestibular rehabilitation therapy in several national and international symposiums. Dr. Han has visited doctors in Japan (2004), Singapore (2005), Italy (2006), Hong Kong (2013), and Australia (2015) to share his experiences and engage in discussions to further his knowledge in his chosen field.