What subject does the man teach now?

M: Good morning. Mary, how’s it going?
W: Pretty good, Bill. How about you?
M: Oh. I’m OK. How is that English class you’re teaching?
W: It’s going really well. I have a great class this year. I’ve got 30 students.
M: That’s good. I love to teach English. I’m only teaching history now.

W: Were you able to use the book that Dr. Nelson put on reserve for our homework?
M: No, I wasn’t. It’s a mystery to me why the library closed early.