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Jeffrey William Clark

Jeffrey William Clark, MD

Internal MedicineMedical Oncology

Mass General Brigham

Highlights

Age Groups Seen

  • Adults
  • Geriatrics

Languages

  • English

Gender

Male

Locations

  1. Mass General Brigham Cancer Institute Medical Oncology Clinic at Boston
  2. Mass General Brigham Cancer Institute Medical Oncology at the Tucker Gosnell Center for Gastrointestinal Cancer
    • 32 Fruit Street, Yawkey Building, 7th Floor, Suite 7e, Boston, MA 02114
    • Get Directions

Expertise

Education

  • Fellowship: EBP,DCE,NCI,NIH,Bethesda,Md, Epidemiology Research, 1985
  • Fellowship: National Cancer Institute, Medical Oncology, 1985
  • Residency: Beth Israel Deaconess Hospital, 1981
  • Internship: Beth Israel Deaconess Hospital, Internal Medicine, 1979
  • Medical Education: Tufts University School of Medicine, 1978

Board Certifications

  • Internal Medicine: American Board of Internal Medicine, 1983
  • Internal Medicine: American Board of Internal Medicine, 1981

Insurance

Search plans
  • Aetna
  • Beech Street
  • Blue Cross Blue Shield
  • Blue Cross Blue Shield - Indemnity
  • 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 ME
  • Medicaid NH
  • Medicaid RI
  • Medicaid VT
  • Medicare
  • Multiplan
  • Railroad Medicare
  • Senior Whole Health
  • TriCare
  • Tufts Health Plan
  • Tufts Medicare Preferred
  • United Health Care
  • Wellpoint
  • WellSense
  • WellSense NH

Ratings & Reviews

4.9 out of 5

175 ratings, 85 reviews

The 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.

Search reviews
  • Reviewed on 5/13/2026

    Dr. Clark is the best He has been my oncologist for 32 years and has taken care of me through my entire cancer battle He literally saved my life, and I will always be grateful. Who ever has him for their doctor is truly fortunate. I followed him from [redacted] to Mass General and he has been my doctor ever since. Regards, [redacted]

  • Reviewed on 5/4/2026

    Dr. Clark was on time for me. I did not have to wait very long at all for him to come and to give me a checkup. So I'm very happy about that. And of course, he understands my current situation in every way. So I trust him completely and thrilled to have him. And I think that probably covers it for this interview. Thank you.

  • Reviewed on 4/22/2026

    He is the kindest doctor you could ever ask for.

  • Reviewed on 4/22/2026

    I always have a good experience. They are great

  • Reviewed on 4/17/2026

    Always attentive and empathetic. Always know he cares.

  • Reviewed on 4/13/2026

    I was very satisfied with the diagnosis and the conversations that the doctor and I had because I was allowed to ask the questions and he took the time to answer them in a way that I would understand.

  • Reviewed on 4/6/2026

    It was perfect Thank you

  • Reviewed on 4/2/2026

    Dr. Clark is wonderful, kind, and thoughtful. I feel so fortunate to have him for a doctor.

  • Reviewed on 3/30/2026

    Always listen and explains everything

  • Reviewed on 4/2/2026

    Dr Clark always listens to to me and my concerns. [redacted]

  • Reviewed on 3/30/2026

    He is a very cautious provider and he is excellent.

  • Reviewed on 3/28/2026

    Dr. Clark is exceptional. He is kind, compassionate and intellectually brilliant. He is engaging providing medical care.

  • Reviewed on 3/27/2026

    Dr. Jeffrey Clark is one of the most outstanding doctors. Dr. Clark is a person who has a high degree of knowledge, knowledgeable of many things, and is highly educated. He's also a very kind person, full of compassion and I try to tell patients as much as possible and he does the best for them. I'm so grateful.

  • Reviewed on 3/27/2026

    Absolutely very good doctor, caring, listens to you. Very, very good.

  • Reviewed on 3/26/2026

    always professional , competent and kind!

  • Reviewed on 3/24/2026

    The Dr listened to all the questions I asked and answered them so I could understand them

  • Reviewed on 3/23/2026

    Dr. Jeffrey Clark is outstanding. I always come away feeling that I am very fortunate to have such a wonderful doctor who understands my situation and gives me confidence that I am well. His comprehension of my particular issues provides me with comfort and knowledge that I am doing the right things to stay healthy.

  • Reviewed on 3/18/2026

    Very empathetic and kind.

  • Reviewed on 3/16/2026

    Dr. Clark is a wonderful doctor. I have every faith in his ability to care for me. He's very caring. He's very knowledgeable. He's very patient. He's very kind. I'm very grateful that I have Dr. Clark as my oncologist.

  • Reviewed on 3/9/2026

    Very competent and easy to communicate with. Answers all questions very clearly

  • Reviewed on 3/9/2026

    I like the attention they give to the doctor and everything, the communication, everything.

  • Reviewed on 3/6/2026

    Dr. Clark is exceptional. He's taken wonderful care of me. He listens, he comments, and he's always very understanding. He's excellent.

  • Reviewed on 3/4/2026

    Dr Jeffrey Clark has been my cancer oncologist since the summer of [redacted]. I saw Dr Clark as a second opinion. He explained everything to me and my family as to the treatment, office visits, follow up, etc. Dr Clark is always available to answer any questions that I have and explains everything in a way that I can understand. Our visits are not rushed. [redacted]

  • Reviewed on 3/5/2026

    Very kind and knowledgeable, provided the information we needed to make a decision. Extremely satisfied with the information we received.

  • Reviewed on 3/4/2026

    Dr Clark is proficient caring and professional as well as an expert I his field.

  • Reviewed on 2/28/2026

    I think he's extremely knowledgeable and very supportive. Always takes plenty of time to answer our questions.

  • Reviewed on 2/25/2026

    Dr Jeffrey Clark has carefully followed my cancer journey with me for 16 years and I'm so grateful now, and always. [redacted]

  • Reviewed on 2/25/2026

    EXCELLENT; OUTSTANDING.

  • Reviewed on 2/4/2026

    I feel Dr Clark is interested in my medical health but I would like more detailed information about results of all my testing

  • Reviewed on 2/7/2026

    Been seeing Dr Clark for over 20 years. Just excellent!

  • Reviewed on 1/30/2026

    I have been really lucky, I feel, to have gotten in with Dr. Clark. He's been wonderful since my first visit and all the follow-up appointments that I've had through Zoom and just keeping on top of all my tests and everything. He's been amazing.

  • Reviewed on 1/30/2026

    Yes, Dr. Jeffrey Clark essentially saved my life with his team [redacted]. I mean, there is nothing negative to say about the care from Mass General. They are all, they all go beyond the call, [redacted] Mass General does go the extra mile for sure.

  • Reviewed on 1/17/2026

    Dr Clark and Dr [redacted] were familiar with my history, recent scans and lab results. I always appreciate Dr Clark's insight and willingness to discuss what my best options are for treatment.

  • Reviewed on 1/10/2026

    Easy to talk with. Good listener and very kind.

  • Reviewed on 1/5/2026

    Dr. Clark has always provided excellent service to me as an oncology patient, and I want to especially recognize his assistant who was there this past visit. I believe she was a practicing physician, and excellent, excellent follow-up and excellent everything. Thank you.

  • Reviewed on 1/1/2026

    Very professional. Dr. Clark has been super to me. Can't say enough great things about him.

  • Reviewed on 1/1/2026

    Excellent doctor is very nice explain well

  • Reviewed on 12/25/2025

    Dr Jeffrey Clark is amazing!

  • Reviewed on 12/19/2025

    This provider did schedule a CT scan and blood tests the same day of the visit and then scheduled a virtual visit for a week later to discuss. Results were posted to patient gateway but could not clearly understand the results. Hoping the results are not serious where patient should be notified immediately. More blood tests were also ordered by his PCP but don't think they were added on the day of our visit and think they should have been added. Otherwise, provider was very professional, knowledgeable, courteous, and addressed all of our questions and concerns. Patient did say he really liked the provider. Provider did discuss other issues not directly related to the visit (concerns that required coordination with cardiology) and recommended follow up consultation and appointments.

  • Reviewed on 12/15/2025

    I am so happy to have Dr. Clark as my oncologist. I rely on him. I trust him. He has been an incredible support to me for many, many years.

  • Reviewed on 12/12/2025

    Extremely helpful, explained things that helped me understand what to expect. A pleasure to talk with.

  • Reviewed on 12/11/2025

    Dr. Clark is highly knowledgeable and well informed. I am very fortunate to benefit from his expertise and impressive knowledge.

  • Reviewed on 11/27/2025

    I love the care and people keeping me alive. My biggest problem is with getting drug refills in time when a new prescription is required. There is a tendency toward beuricratic momentum as I feel there is some resistance to existing strict policies.

  • Reviewed on 11/26/2025

    Thanks

  • Reviewed on 11/20/2025

    Dr. Clark is extremely knowledgeable and always take the time to answer questions.

  • Reviewed on 11/20/2025

    Dr. Clark is an excellent doctor! He listens and spends the time you need in the office.

  • Reviewed on 11/20/2025

    He was very helpful talking to my daughter about and myself to everything and he took time to explain everything and to give me thought, refer me to another, for another appointment.

  • Reviewed on 11/17/2025

    Dr. Clark is beyond the best!

  • Reviewed on 11/17/2025

    Dr. Clark and his entire team are incredibly knowledgeable, expert, and compassionate in dealing with patients, particularly in my case, my [redacted]-year-old mother. Just couldn't say enough great things. Thank you.

  • Reviewed on 11/7/2025

    Very kind and thorough provider, has called me at each hospitalization no matter where I am.

  • Reviewed on 11/5/2025

    I have never experienced any kind of bad treatment. Has been very knowledgeable and shows concern in my care.

  • Reviewed on 11/7/2025

    Dr. Clark is an excellent oncologist on the type of my cancer. After follow-up treatment and care via Dr. Clark's team for nearly two years, my physical condition has significant improved. Dr. Clark used medical methods with great caution and precisely employed necessary tests to diagnose my various sudden symptoms. He also paid a great attention to the Chinese traditional medicine that I received during the course of recovery after my surgery. He listen patiently to my description and treat my anxiety professionally. I deeply trust and rely on the treatment provided by Dr. Clark for my recovery.

  • Reviewed on 11/2/2025

    Doctor Clark and him nurse and staff are all nice and very helpful and listen to me I am very happy with them .

  • Reviewed on 10/31/2025

    Dr. Jeffrey Clark is an excellent doctor. I'm very happy with him.

  • Reviewed on 10/29/2025

    Dr Clark is smart and caring. I know he wants the best for me. He had to tell me my cancer was progressing and I needed to be treated with chemotherapy again...so not an easy visit but he delivers bad news in a caring way and with optimism that treatment will help.

  • Reviewed on 10/30/2025

    I always learn something new at every visit. Every provider has always listened to me babble on and get me good solutions for my current problems.

  • Reviewed on 10/27/2025

    Warm and caring, thorough and thoughtful- he took the time to explain everything and answer questions

  • Reviewed on 10/21/2025

    The very fact his title "oncologist" infers, seriousness and death, he puts me at ease, and instills peace and deliberate action, or inaction when necessary. I'm glad I was referred to him.

  • Reviewed on 10/6/2025

    Dr. Clark is a wonderful doctor who is very dedicated to his patients and he explains things very well and he said he was going to follow up with the scan which had been submitted and he did that at 7 o'clock at night. So he's just a tireless worker.

  • Reviewed on 10/7/2025

    I'm very happy as a patient at mass general

  • Reviewed on 9/29/2025

    Dr. Clark is one of the nicest, kindness and knowledgeable doctors we have met. We would recommend him to anyone that needed an oncologist. We feel he is the best MGH has.

  • Reviewed on 9/24/2025

    Dr. Clark is the best. So knowledgeable and caring.

  • Reviewed on 9/22/2025

    Very good

  • Reviewed on 9/22/2025

    Dr. Clark is always very kind, calm, knowledgeable, and helpful, and has been a big part of my care for 13 years. Highly recommend him.

  • Reviewed on 9/20/2025

    Dr Clark is the best

  • Reviewed on 9/15/2025

    Dr Clark is knowledgeable, friendly and proficient. Trust him completely.

  • Reviewed on 9/8/2025

    As always perfect

  • Reviewed on 8/30/2025

    Drs Clark and [redacted] are incredibly responsive doctors who listen and have so much experience. They helped me feel more at ease. I also enjoyed listening to them collaborate about care ideas.

  • Reviewed on 8/28/2025

    Dr. Clark is the best. He really knows medicine and how to treat my cancer. He keeps me informed and offers great advice. His manner is always pleasant. I really like that Dr. Clark tells me exactly what is going on. I couldn't be more pleased.

  • Reviewed on 8/28/2025

    Dr. Clark is always patient, mindful of my concerns and willing to answer anything, any questions that I have that are about this appointment or any other appointments.

  • Reviewed on 8/28/2025

    Prompt and professional.

  • Reviewed on 8/18/2025

    Dr. Clark is exceptional, very knowledgeable, very kind and a great listener . He explains well and puts you at ease. I feel under his care I am safe, I trust him.

  • Reviewed on 8/14/2025

    Iwas so impressed with Dr. Clark. I am 100 percent confident in my care and so happy I went there. Thank you for everything. [redacted]

  • Reviewed on 8/17/2025

    they explained things clearly

  • Reviewed on 7/26/2025

    Dr. Clark is kind and considerate of any concerns I have.

  • Reviewed on 7/21/2025

    He was great

  • Reviewed on 7/21/2025

    Dr Clark is the best! He is knowledgeable, patient and listens to my needs. He spends as much time as needed to make me feel comfortable.

  • Reviewed on 7/16/2025

    Knowledgeable, kind, never rushes.

  • Reviewed on 7/12/2025

    This oncologist was well spoken and knowledgeable. I was , however, completely distracted by his comb-over. His hair kept falling in his face and he had to remove it regularly. He's a grown-ass man. Have him cut his hair please.

  • Reviewed on 7/7/2025

    I feel after the visit between us and Dr. Clark. I trust his opinion. I feel very confident of the doctor.

  • Reviewed on 7/6/2025

    Very thorough and explained everything to me. He covered all my concerns.

  • Reviewed on 7/4/2025

    Dr. Clark was filling in for somebody else that wasn't available, but he did a fantastic job and took care of everything.

  • Reviewed on 7/2/2025

    Dr Clark is very knowledgeable and compassionate. I value his input about my care.

  • Reviewed on 6/24/2025

    He has been my provider for over 20 years. Unfortunately he has been unable to prevent me from getting older.

  • Reviewed on 6/22/2025

    I was actually very happy to see a gastroenterologist, as most if my problems are directly related to those issues. He was very informative and helpful!