If a person has a Juris Doctor degree, do you address him as doctor?

Answer 1

No. Mr. or Ms./Mrs. is fine. If writing to them, you can add "Esq." to the end of their name, but it's not necessary.

I'm an attorney, and I've never seen attorneys refer to each other as "doctor." Personally, I only do it as a joke or to make a point. I only consider MDs (and possibly a limited number of PhD's) as real doctors. So, when someone who isn't what I consider a "real" doctor starts making a big fuss about their title (usually, it's the tone of voice), I'll start demanding that they refer to me as "Dr." as well. It's pretty much understood that no one calls attorneys as doctors, so they usually get that they're making too much of a fuss about their title.

Answer 2

No, but in certain situations you could append Esq. for Esquire to the end of their name. According to Wikipedia:

"According to legal usage expert Bryan Garner (A Dictionary of Modern Legal Usage, 2d ed.), "Esq." is to be placed after an attorney's name by another person, but never to be appended by the attorney himself or herself. Thus, one attorney writing to another would address the letter's recipient as "Jane Brown, Esq." but would sign himself as "John Doe"."

Answer 3

Counselor

Answer 4

No, Attorney