Taskmaster and Handler

noun

• Someone who imposes hard or continuous work. .

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

noun

• One who trains or exhibits animals.
  • synonyms: animal trainer
• An agent who handles something or someone.
  • usage: "the senator's campaign handlers"
• Sports) someone in charge of training an athlete or a team. (.
  • synonyms: coach, manager