Dr. Il Joon Moon completed his internship at Seoul National University Hospital in 2001 and served as a resident in the Department of Otorhinolaryngology at the same hospital from 2002 to 2006. From 2006 to 2009, he fulfilled his military duty as a military medical officer. In 2009, he returned to Seoul National University Hospital as a clinical fellow, and in 2010, he served as a research fellow at Samsung Medical Center. From 2011 to 2014, he worked as a clinical assistant professor at Samsung Medical Center.

Between March 2012 and February 2014, he worked as a visiting scholar at the University of Washington Medical Center, where he conducted research on cochlear implants and auditory neuroscience. Since 2015, he has been a professor at Sungkyunkwan University School of Medicine and a faculty member at Samsung Medical Center, specializing in the treatment of various ear diseases.

He pioneered endoscopic ear surgery in Korea and has performed approximately 700 transcanal endoscopic ear surgeries to date. In addition, he has run cochlear implant clinic in Samsung Medical Center, and has conducted 960 cochlear implant surgeries so far. As the director of the Hearing Research Laboratory at Samsung Medical Center, he leads numerous national and industry-academic collaborative clinical studies related to hearing.

He is recognized as an expert in diagnosing and treating all types of hearing loss and in performing surgeries for implantable hearing devices. In terms of academic contributions, he currently serves as the General Secretary of the Korean Otological Society and as the Scientific Director of the Otology Committee of the Korean Society of Otorhinolaryngology-Head and Neck Surgery.