Mentors. The patient doesn't need credentials, the doctor does.
What we've learned is that people want to be taught by those with experience – just like you want to be mentored by a co-worker with a lot of experience.
Virtually all of our students have full-time jobs, so perhaps this insight applies more to our market than others.
Also note that most education for adults advertises the _real world_ experience and prominence of their professors, rather than from where they received a degree.
http://www.starling-software.com/employment/programmer-compe...