Teacher can be understand as "master" (in), just be sure to mention the context wherever you use "in" so teacher can be implied.

For example:   "Dovahzul Teacher" is "Dovahzul In" or "Insedovahzul" or "In do dovahzul".

Why type of "discipline" are you asking about? A "discipline you learn in school" can be translated to "understanding of ___" (mindoraan do ___). Discipline, as in "training to obey" or "rules of behavior" can be translated to "obedience" (thaarn) or "obedience in ___" (thaarn ko ___).