After the award of his Ph.D., Mori remained as an assistant at Kyoto until 1980 when he was appointed as a lecturer in mathematics at the University of Nagoya.
Pagkatapos ng award ng kanyang Ph.D., Mori naiiwan bilang isang assistant sa Kyoto hanggang 1980 kung kailan siya ay hinirang bilang isang lektor sa matematika sa Unibersidad ng Nagoya.