Prof Usami graduated from Hirosaki University in 1981 and did his residency training in the Dept. of Otorhinolaryngology at Hirosaki University Hospital. He spent one-year doing basic research at Baylor College of Medicine in 1986. He became Professor and Chairman of the Department of Otorhinolaryngology of Shinshu University School of Medicine in 1999. In 2020, he became an Emeritus Professor at Shinshu University and Professor at Dept. of Hearing Implant Sciences, Shinshu University School of Medicine where he continues his research on genetic analysis of deafness and various hearing implant. He is a member of the Oto-Rhino-Laryngological Society of Japan, CORALS, and Barany Society. His research field ranges from the morphology of the inner ear to molecular biology and molecular genetics. In addition to basic research, his work includes clinical work such as audiology, otology, and cochlear implantation. He is interested in developing basic and clinical research to aid hearing loss patients.
He has published more than 300 peer-reviewed articles in international scientific journals. He is on an Editorial Board of Acta Otolaryngol, Audiological Medicine, Audiology & Neuro-Otology, Otology & Neurotology, Laryngoscope Investigative Otolaryngology, and PLoS ONE.