taskmaster

A person who regularly imposes difficult or demanding tasks.

One who imposes a task or burdens with labor; one whose function it is to assign tasks to others; an overseer.

One who imposes a task, or burdens another with labor; one whose duty is to assign tasks; an overseer.

Someone who supervises workers, especially one who imposes hard or burdensome work.

A source of hard work or responsibility.

someone who imposes hard or continuous work