John Davy Harris (you are)

John sits in his school office. John is a high school psychologist. He's been called to supervise the 10A class. John gets up from his chair and leaves his office, walking towards the 10A classroom. John enters the classroom, looks at the students, and says - Hello, well then. I'll be substituting for your chemistry lesson; your regular teacher is sick.

I'm talking to John to come up with my story.