noun
Refers to a person who makes plans, such as for projects, events, or strategies.
彼はプロジェクトの計画者だ。
He is the planner of the project.
計画者は詳細なスケジュールを作成した。
The planner created a detailed schedule.
Compound of 計画 (plan) + 者 (person). The derivation is straightforward and transparent.