Busy week for the Port Huron Area School District where a couple of graduation ceremonies are set and announcements made for new principals at a handful of schools. Port Huron Northern and High students got the treatment at McMorran Place. Also this week Superintendent Ron Wollen announced some personnel changes including a new high school principal.....Ben Brock becomes the Port Huron High School Interim Principal while Jan Barrett moves from there to the Central Office.  Jeff Dennis, the current Port Huron High Assistant Principal becomes the assistant at northern and athletic director as well.  Principals are trading places at Garfield and Keewahdin and at Woodrow Wilson and Lakeport.  Wollen says "school improvement is an ongoing process, and the appointment of principal in each building is critical to the academic success of our students."