Funny, I sat next to David at the ASM, and asked whether he was one of NWBO lawyers - he said no of course and really didn't want to engage. Then spoke with him a bit later and he opened up a little more about his relationship with the company - at the time he just said he was taking on an advisory role.
I do wonder if he still maintains some business relationship with Oppenheimer or his existing clients. I don't know one way or the other, but certainly a question to ask. Nearly everyone at NWBO wears multiple hats, and not necessarily NWBO hats.