Ban-seok Han is a human factor researcher at the medical device usability testing center in Seoul National University Hospital for 6 years, conducting usability tests of many kinds of medical devices. He is the first human factor researcher of the very first usability testing center established in Korea. He received a bachelor's degree in biomedical engineering from Yonsei University. He is interested in usability engineering in the development of medical devices, human factors in healthcare systems, and the cognitive psychology of healthcare providers.