You could have simply searched this versus posting, but he never completed a residency. To go into US medical school debt and not complete your training is strongly indicative of deep rooted problems.
It doesn't matter what went wrong- he is not a credible leader. If you are going to lead doctors, you should be a doctor. It doesn't matter why you didn't become a doctor.
Doesn’t this just mean not practicing? Broadly speaking, that per se seems fine.