If I e-mail and ask for a response, he usually e-mails back...unless he has a lot to say, then he calls and leaves a message. He's not a big typer

If I call and ask for a call back, he calls.

I e-mail and leave voice mails a lot but don't ask for a return e-mail/call. It's just a way to connect and get things out of my head, and it helps. So, if I need some kind of response, I ask, otherwise, it's enough to just reach out.