Email is a wonderful thing for people whose role in life is to be on top of things. But not for me; my role is to be on the bottom of things. What I do takes long hours of studying and uninterruptible concentration. I try to learn certain areas of computer science exhaustively; then I try to digest that knowledge into a form that is accessible to people who don’t have time for such study.
It should be said that this probably shouldn’t only apply to computer science professors, but to anyone interested in doing the deep work of research, understanding, and making that research digestible for others.