Disciplinarian (noun)

A person who believes in or enforces strict control and rules, especially in education or training.

Origin:

From latin disciplinarius, from disciplina ("discipline, instruction, learning"). disciplinarius is formed from the prefix dis-, meaning "apart," and plicare, meaning "to fold.".

Examples:

1. The headmaster was known as a strict disciplinarian, who would not tolerate any misbehavior from students.
2. The football coach's reputation as a disciplinarian helped the team to stay focused and motivated.
3. The disciplinarian approach taken by the parents resulted in the child's improved behavior and grades.
4. The camp counselor was a disciplinarian who kept the campers in line and made sure everyone followed the rules.
5. The army instructor was a disciplinarian who demanded discipline and respect from all the recruits.