Taskmaster

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

Thesaurus Entries

Big Brother, Simon Legree, auditor, boatswain, boss, chief, comptroller, controller, floor manager, floorman, floorwalker, foreman, gaffer, ganger, head, headman, inspector, monitor, noncommissioned officer, overman, overseer, proctor, sirdar, slave driver, straw boss, subforeman, super, superintendent, supervisor, surveyor, visitor