
Highlights
Age Groups Seen
- Adults
- Geriatrics
Languages
- English
Gender
FemaleLocations
- Massachusetts General Weight Center
- 50 Staniford Street, Suite 430, Boston, MA 02114
- Get Directions
- phone: 617-726-4400
- fax: 617-724-6565
Expertise
Education
- Fellowship: Brown University, general internal medicine, 1995
- Residency: University of Cincinnati Medical Center, internal medicine, 1993
- Internship: Good Samaritan Hosp & Hlth Ctr, internal medicine, 1991
- Internship: Letterman Army Medical Center, 1990
- Medical Education: Tufts University School of Medicine, 1989
Board Certifications
- Internal Medicine: American Board of Internal Medicine, 1993
Insurance
- Aetna
- Beech Street
- Blue Cross Blue Shield
- Blue Cross Blue Shield Medicare
- Cigna
- Commonwealth Care Alliance
- Coventry
- Fallon Health
- Harvard Pilgrim Health Care
- Humana
- Maine Community Health Options
- Mass General Brigham Health Plan
- MassHealth
- Medicaid CT
- Medicaid NH
- Medicaid VT
- Medicare
- Medicare ACO
- Multiplan
- Senior Whole Health
- TriCare
- Tufts Health Plan
- Tufts Medicare Preferred
- United Health Care
- Wellpoint
- WellSense
Ratings & Reviews
4.6 out of 5
112 ratings, 39 reviewsThe Patient Satisfaction Rating is an average of all responses to the care provider related questions shown below from our survey. Patients that are treated in outpatient or hospital environments may receive different surveys, and the volume of responses will vary by question.
- Reviewed on 3/3/2026
Dr. O'Brien is uniquely great in that she combines very authoritative and direct feedback with humane and compassionate awareness. She is excellent!
- Reviewed on 3/2/2026
She does an excellent job
- Reviewed on 2/25/2026
Dr O'Brien was very helpful and actively listened to me.
- Reviewed on 2/8/2026
Dr. O'Brien is a caring, smart and delightful doctor who knows her job well and her patient even better. It was a pleasure to work with her.
- Reviewed on 1/29/2026
She has always been very timely, very considerate, and very thorough. I like working with her a lot.
- Reviewed on 1/17/2026
Nurse was outstanding as is Dr. Gail. I look forward to working with them to lose weight.
- Reviewed on 12/22/2025
She is very professional, direct and thorough. She doesn't waste time.
- Reviewed on 12/12/2025
Thanks
- Reviewed on 11/26/2025
I really like Dr. O'Brien, she is very supportive of my weight loss goals, she listens to me and helps me put together a plan to continue improve my health
- Reviewed on 11/10/2025
She listened, was kind, responded in a way I understood without using medical terms that were not understood
- Reviewed on 11/5/2025
Wow... a knowledgeable and caring doctor. She has the ability to listen and treat me as an individual. This engagement with her has made all the difference in the outcome. I feel truly blessed / lucky to have her as my physician.
- Reviewed on 10/16/2025
I enjoy working with Dr. O'Brien. She explains things well and answers any questions I may have.
- Reviewed on 10/13/2025
Great
- Reviewed on 10/10/2025
Dr OBrien is a kind well informed( about me) doctor. She listens and balances my needs with my medical care. She's amazing
- Reviewed on 9/29/2025
Dr. O'Brien is the BEST medical provider I have experienced amongst the several I have seen from Partners Network over the years. Dr. O'Brien is empathetic, informative & listens carefully to you as a patient. I wish all providers could be the same as Dr. O'Brien! Sincerely, [redacted]
- Reviewed on 9/26/2025
I have been a patient of Dr Gail O'Brien for over 3 years. She has been instrumental in helping me achieve my healthy lifestyle goals. I have lost almost 100 pounds in this time, bringing my cholesterol and A1C numbers into the healthy range. She made the experience easy, being supportive, informative, and realistic. She really listened to me and made adjustments to provide me with the best opportunity for success. I don't believe I would have achieved this success without her being my guide.
- Reviewed on 9/22/2025
It was good
- Reviewed on 9/20/2025
She is great! She understands what my issues are and makes good recommendations on my treatment. She is an A+. I would definitely recommend her.
- Reviewed on 9/17/2025
Excellent communication and result oriented.
- Reviewed on 9/5/2025
Provider actually listens to your concerns and cares about your health.
- Reviewed on 9/6/2025
As far as Dr. O'Brien goes, I'm going to say some of my favorite aspects of her as my doctor are she does not leave her on the bus. She gets right to the point, which is very important when you get such a short amount of time during your appointments with your doctors these days, especially in virtual visits. The other thing I truly love about her is Sometimes we cannot be 100% sure if A, your doctor is hearing what you're saying at most of them, and B, you cannot always be sure that they're hearing correctly of what you're saying at most of them. And the thing I love about Dr. O'Brien is when I ask the questions, try to clarify something or ask for advice,
- Reviewed on 8/8/2025
It's always a pleasure to meet with Dr. O'Brien. She's very thorough, compassionate, and checks all the boxes, checks everything, makes sure everything is going okay and goes above and beyond her specialty.
- Reviewed on 8/6/2025
Excellent provider
- Reviewed on 7/31/2025
Provider is very down-to-earth and very knowledgeable, very respectful, and very honest.
- Reviewed on 7/26/2025
I felt she was very dismissive and judgemental. [redacted] When I asked about extra fiber supplements, she said she normally recommends vegetables which I eat plenty of. She also made comments about my meal log which just happened to be for the previous day and wasn't a good representation of what I normally eat. I think patients should be shown kindness and compassion and she did not exhibit that.
- Reviewed on 7/21/2025
Everything went well they answered all my questions were very patient. No complaints at all.
- Reviewed on 7/13/2025
Dr. O'brien explained things very clearly and listened to my concerns. I am looking forward to working with her on my "new" weight loss journey.
- Reviewed on 7/12/2025
Dr O'Brien is knowledgeable about my son and very helpful. She listens carefully and has taken great care of him.
- Reviewed on 7/2/2025
It was a productive visit
- Reviewed on 6/30/2025
It was an ok experience I would say. She didn't agree with much of what I had to say.
- Reviewed on 6/26/2025
Yes, Dr. O'Brien is awesome. She's very thorough. She listens to you. She takes the time with you just to kind of understand if there's any sort of questions you may have and give you some great detailed explanations. Great doctor. So thank you.
- Reviewed on 6/23/2025
I appreciated the time and care Dr. O'Brien took with me on my first visit. She had clearly read my history, asked salient questions, explained her suggested treatment plan and the office processes, and answered my questions. Thank you Dr. O'Brien!
- Reviewed on 6/18/2025
Dr. O'Brien was wonderful. She listened to all my concerns and explained everything I needed to know, in a nice clear manner.
- Reviewed on 6/11/2025
The provider was fine but disappointed with the lack of information prior to the appointmennt. [redacted]
- Reviewed on 6/9/2025
The doctor demonstrated lots of knowledge about my recent medical care especially my recent eye surgeries. She knew I had stopped my Zepbound. I was very impressed. Very kind in the way she speaks to me.
- Reviewed on 6/6/2025
Dr. O'Brien treated me with respect. She was very knowledgeable. She answered all my questions and she was very encouraging about my weight loss and gave me a lot of positive feedback. I would certainly recommend her to be in my practice since I'm a physician.
- Reviewed on 5/21/2025
HI. It was really good. Yeah, she was ... Dr. O'Brien was really good and she started me on some [redacted] and things are looking good. So, yeah, she was excellent. All right, bye, thank you.
- Reviewed on 5/14/2025
Dr O'Brien is great. Listens to your concerns and provides advice and guidance.
- Reviewed on 5/14/2025
I love that Gail O'brien asked me if I wanted to meet with someone from the nutrition department again. I met with a dietician regularly when I first started on GLP-1s at her suggestion and I think it will do me a lot of good to get a touch-up meeting with someone from nutrition. So fabulous care, got the whole product with a full range of care and I think that is so rare when it comes to people who are taking GLP-1s. I talked to friends who have never had anything beyond the prescription and no insight from their doctor how to handle taking these drugs or any insight. So totally appreciate that from Mass General and thank you very much.