One teacher in a grouping that can see all of the groups?

I am using Moodle 2.1 and starting to use the grouping feature.  I have one course that I sell to school districts and multiple schools use the course.  So picture it like this:

Hometown School District has three schools using my course:  Bluff Lake High School, Urban Creek High School, and Central Park High School.  I have separate groups set up for each of the schools so the teacher at each school can only see the students that go to their school.  However, there is district administrator at Hometown School District that would like to view all the data from all the schools.  Suggestions?  

Thanks!