I don't think he likes to give too much away about his background on the forum. He has to contend with members of cult like forums, wanting to rip him to shreds because he pulls their beliefs apart. He basis everything on proper Science and how the body really works, and they don't like that. I have been on this forum a couple of months and found Hv to be incredibly knowledgeable, in fact his knowledge astounds me.
I'm sure he would let you know privately though. I have never bothered to ask, as he makes sense to me. Doctors have qualifications but i don't trust them one iota.