Manager
noun
管理 is "management." A management person is a manager.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
忙しい一日を終えて、管理人に「早く仕事を切り上げて帰りたい」という魔がさした。
After such a busy day, the manager was tempted to close up and go home early.