Due Diligence...but not on propery

[JH Bridge]

BP nation,

We have all heard that finding a mentor is a very helpful, even crucial, step in RE investing. We also have heard that taking action is also crucial. I may have found an opportunity for both but have one looming question...How does one go about doing due diligence on a particular investor? We had met at a local Denver investor networking group, and seems to be an experienced investor willing to give up time to mentor a newcomer (no deals under my belt, yet). There has been no "gut" feelings, nor any acts that seem out of the ordinary. A simple google search has turned up nothing noteworthy (positive or negative). Still, I would like to do my due diligence and know that this person is truly someone willing to help a newbie along. Do you suggest asking for references? If so, how do you approach that without offending? Any suggestions are welcome, and truly appreciated. Thanks for your advice