The short version: Dr. Hansen knows his stuff, works quickly, won't make you wait, is polite and professional, and has a reputation at least in the area of pregnancy-related physiotherapy (and almost certainly does great in every other area).
Long version: I'm currently pregnant w/ twins, and had a related side effect of rib pain. The Evergreen midwives recommended Dr. Hansen, and am I glad I took that recommendation! As soon as I told him where I was uncomfortable, he had a guess for the diagnosis, confirmed it in three minutes, and fixed it in another 5 minutes. The problem? A rib became dislocated! Since then, I've had to see Dr. Hansen several times for related problems. He's always made an effort to squeeze me into his busy schedule ASAP, and is always polite, professional, and very quick - no long waits at his clinic!
I'm not the only one who recommends him, either - he is the most commonly suggested physiotherapist in the EMOMS (Eastside Mothers of Multiples) forums. He seems to have an especially strong reputation working with pregnant women, including mothers expecting twins or more. I would assume he is very skilled with other areas as well, this is just where I've encountered his name.