Recommended hair transplant doctor in Seattle, Portland or San Francisco

I am almost 60 years old but have decent hair. I am starting to get a very thin area on top and a little spot in the back. I am thinking this would be a good time to add to those areas before they get so thin it really starts affecting my appearance and before the grafts would show so much. I live in the northwest in a city that is too small to have a physician who can do this work. I need a recommendation for one of the larger cities so I could fly in and have the procedure done. Thanks!