I really don't know if this doctor is very knowledgeable or not. I have seen him three times and we didn't get to the root of the problem I was having and I took it upon myself to go somewhere else. I am still waiting for that appointment, so we'll see... Dr. Col's bedside manner is quite unapproachable. He seems proud and a bit pompous and he's quick to throw away other professionals opinions (I had seen a doctor prior to him and Dr. Col didn't seem to want to hear about what that doctor had to say). Overall, I'd say I'm not impressed with Dr. Col because more of his personality than his knowledge of medicine.