I called his office to get appointment from Dr Tierney and explained that I need an urgent colonoscopy. The office told me Dr only takes patient by referral. I called my Dr and he sent an urgent referral to Dr Tierney's office. this was 3 months ago. I called few times since and each time, I was told they will call me back but did not. This office hosts a few great liars. you can tell a lot about a Dr by the office he/she runs.