At first, I thought this was an old article, but apparently not. Man, that doctor is a real piece of work, especially to be on ProPublica's radar twice. They're very thorough, so it's not often they have to write more than one in-depth piece on the same person.
Here's an earlier ProPublica story on him (which I confused with this article): https://www.propublica.org/article/thomas-weiner-montana-st-peters-hospital-oncology