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.