I also wanted to add that the Director of Admissions for a private elementary and high schools also makes decisions regarding the acceptance of applicants.
They determine what the criteria are for those students that are accepted and put on the wait list as well as those that are rejected. The Director of Admissions also reminds applicants of the testing schedule and is usually involved in open houses and new student orientations.
The admissions office also has to keep track of wait listed applicants and let them know when space becomes available. They also are responsible for making sure that student enrollment is at its optimum level.