I'm wondering, is this person ordained or not. If so, in what tradition, if not, by what authority does he teach? I decided a while back that I was open to lay people teaching technique (i.e. sit upright, focus on the nostrils etc), I really couldn't care less about their interpretations of the dhamma. For my questions on sutta studies and the like, I rely on fully ordained (ordained under, and observing the full monastic code, not just ordained under the bodhisattva precepts as is common in Japan) for guidance and insight. While ordination is no guarantee, it is at least a verifiable credential, and at least one indicator of the teacher's dedication to the dhamma and students.