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.

M : I like science more than maths, but history is my favorite subject.
W: But I think computer programming is the best.