noun
head researcher; chief researcher
Refers to a senior research position, typically at a research institute, university, or corporate R&D department. The title implies leadership of a research team or project.
彼は国立研究所の主任研究員として働いている。
He works as a head researcher at a national research institute.
主任研究員に昇進して、自分のチームを持った。
I was promoted to chief researcher and got my own team.
Compound of 主任 (chief, head) and 研究員 (researcher).