disciplinarian
noun [ C ] uk/ˌdɪs.ə.plɪˈneə.ri.ən/ us/ˌdɪs.ə.plɪˈner.i.ən/
（尤指信奉惩罚的）严格的管理者，严厉的领导
someone who believes in keeping complete control of the people he or she is in charge of, especially by giving severe punishments
a strict disciplinarian 严厉的领导
Synonym: martinet