Graduated from Tokyo Medical and Dental University, he said that if he hadn't become an actor, he would have become a dentist.

[2] Through connections, he began appearing in period dramas and pursued a career as an actor.

There, he was encouraged to enroll in the voice acting program due to his experience in period and contemporary dramas.

After gaining experience as a teaching assistant, he was told about voice acting opportunities and made his voice acting debut in 1982 as Dr. Hyblow in the television anime Cybot Robotchi.

Umezu went on to work with NPS Theatre, Arts Vision, and eventually joined 81 Produce.