IMO if I wanted to contact DPR I would make it known in the places he frequents - SR boards perhaps? And leave my list of q's for him with a secure place to have the answers sent. Or, at least, a secure way to set up communications.
I don't think it will be a matter of you contacting/finding him so much as it is the other way around.
But that's just my stab at it.
Thanks for the advice... I wasn't able to post on other boards, it seems, as a Newbie...?
Re: Secure way - is there a best way to do that? I'm really only familiar with conventional means of communication, email, skype (in person!).. ha...