headmaster; principal; dean; provost; rector
Refers to the head of a school or academy, especially in private or specialized institutions. The exact English title depends on the type of school (e.g., principal for a school, dean for a college, rector for a university).
The headmaster gave a speech at the entrance ceremony.
She is the principal of this academy.
理事長 is the chairperson of the board of directors, often overseeing the entire educational corporation, while 学園長 is the head of the school itself.
Compound of 学園 (がくえん, 'academy, school') and 長 (ちょう, 'head, chief').