John Brennan, MD

Dr. John Brennan is a Pulmonologist in Exeter, New Hampshire. Dr. Brennan is board certified in Internal Medicine, Critical Care Medicine and Pulmonary Medicine. His clinical interests include multidisciplinary lung cancer care, endobronchial ultrasound, navigational bronchoscopy, pulmonary nodules, general pulmonology and critical care.

Dr. Brennan has been recognized as a Top Doctor in Pulmonology by NH Magazine 2017, 2018 & 2019.

  • Undergraduate: Tufts University, Boston, MA
  • Graduate: Tufts University School of Medicine, Boston MA
Rhode Island Hospital/Miriam Hospital Brown Medical School, Providence, RI
Pulmonary and Critical Care Medicine, Tufts Medical Center, Boston, MA
Board Certified
Internal Medicine, Critical Care Medicine, Pulmonary Medicine

Patient Rating
4.8 out of 5
121 Ratings


Core Physicians
3 Alumni Drive
Exeter, NH 03833
Phone: (603) 775-0234
Fax: (603) 772-1188
Hours: Monday - Friday 8:30am - 12:00pm, 1:00pm - 5:00pm

Verified Patient Reviews & Comments

The Patient Rating score is an average of all responses to physician related questions on our nationally-recognized Patient Experience Survey. Responses are measured on a scale of 1 to 5, with 5 being the best score. Comments also are gathered from our Patient Experience Survey and displayed in their entirety. Patients are de-identified for confidentiality and patient privacy.

Have already told them that Dr. Brennan was great and explained to me what was going on very clearly.


He's excellent, he's very knowledgeable, he's very smart. I would feel very confident heading a little more time spent with him since that was my 1st time to be very happy.


Highly recommend, great pulmonologist


He's Great Doctor in so many ways!! I would HIGHLY RECOMMEND him!!!


He always listen and let's me know if there is any problems to call him.


He was very helpful and supports my health needs


I liked him right away and that he made me feel safe and comfortable.


id recommend him to anyone


I would definitely recommend him


I feel Dr. Brennan is very interested in seeing me. I've only been with them now little over two years because we moved into this area and you've been very helpful in seeing and checking my lungs and it's kind of hard with the situation right now, but I like it there and i think he does a great job. Thank you.

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