from what I have heard about him, his theories are in line with others related to the gut and to oxidative stress; however, I am not familiar enough with him to really be able to comment or to accurately assess what he suggests.....I do know that pro-health has had stuff about him and they generally are a pretty good source of info
I would suggest that you try putting this in the section about doctors, though, you might get more responses that way....and also maybe try asking if people know about him or his theories, rather than just if they have seen him or tried his treatments