My 9th grade English teacher is an AKA, I know as she had a license plate frame on her car.
My cheer adviser is a DZ at the school where I went, but I didn't find that out until I came back for homecoming. I don't know if both are still active in their respective orgs, but I had always wondered after I figured out what the greek system was. I was pretty clueless going in to school as I am the first person in my family to be greek and go to college as well.