Leif William Ellisen, MD, PhD

Patient Feedback

4.987692 average rating from 65 reviews

• I look forward to my yearly visits

  2026-06-27

• Excellent checkup.

  2026-06-21

• Dr. Ellisen was wonderful. Prepared, easy to understand, easy to talk with, kind, professional, superior knowledge of his soecialty, methodical and organized in his apptoach to answering my questions. Highly recommmend.

  2026-06-15

• Appointments with Dr Ellisen are always informative and thorough. He reviews my current status, provides updates specific to my condition, and clearly answers any questions I have. The exam is efficient but I never feel rushed. Timely responses are received whenever I contact this office via the portal. I feel fortunate to have Dr Ellisen my healthcare provider.

  2026-05-24

• Professional

  2026-05-23

• Dr. Ellisen is knowledgeable and compassionate. An outstanding physician who is always aware of the latest research and developments related to my care. I feel confident in knowing I am in great hands.

  2026-05-17

• He was so thorough in examining my mammogram that he spotted lung cancer. He then connected me with a team which resulted in proton radiation. I 100 percent trust him with my care.

  2026-05-10

• Everything went smoothly and was running on time

  2026-04-20

• Dr. Ellisen is wonderful!

  2026-03-30

• An extraordinary physician. Am lucky to be a patient

  2026-03-29

• By chance, my sister had also been assigned Dr. Ellisen for her treatment, so I had heard a fair bit about him in advance, but I can't express how far he exceeded my expectations. His manner is so kind, he didn't just answer every question I had, but often expressed how they were a GOOD question, like he appreciated it, that they were in no way a burden on his time. He explained everything in a way that was easy to understand and with references to research studies. I feel totally comfortable with my treatment in his hands going forward.

  2026-03-29

• I've been seeing Dr. Ellisen for the past 20 years annually, and he is always kind, respectful, and always offers for any time I need to call or email him, and he does respond. I'm very appreciative of the care he's given to me over the past 20 years.

  2026-03-18

• He's great.

  2026-03-16

• Dr. Ellisen was very informative, very calm, very complete with all his answers and all the information he provided. He was very thorough and informative.

  2026-03-09

• Dr. Ellisen is the best. He listens, is empathetic and compassionate and very warm and caring. His knowledge is extraordinary and he always takes his time and answers all of my questions. Just a wonderful doctor who is always cheerful.

  2026-02-01

• Dr Ellisen is an outstanding Doctor and a highly respected member in his field. He knew the answers to every question that I had and also asked for very important information from me. We liked him very much and I look forward to seeing him again.

  2026-01-26

• [redacted] I continue to be thankful and grateful to Doctor Ellisen and his team at MGH. [redacted]

  2026-01-26

• Excellence in practice. The doctor listened to me, answered every question, and communicated a clear plan for follow up.

  2026-01-12

• Dr Ellisen is a great doctor. He is extremely knowledgeable; personable, thorough, and has a great sense of humor. He reviews all of my treatment options and answers all of my questions. He puts me at ease. He is a great asset to MGH !

  2026-01-07

• I've been a patient of Dr. Leif Ellisen for a number of years and he's the best. Thank you.

  2026-01-05

• Dr. Ellisen is the best. He had already reviewed my record before coming into the exam room. He explained the type of cancer I had and the progress being made with research. He never rushes through my visit and I always feel I'm getting the best care available.

  2025-12-20

• Dr. Ellisen is kind, caring and so knowledgeable. I always feel at ease and empowered when I leave these appointments!

  2025-11-24

• Dr. Ellisen explains everything in detail in layman's terminology not medical terminology which is very much appreciated. I do not feel like I'm a number with Dr. Ellisen. He 100% cares about my well being.

  2025-11-23

• Dr. Ellisen was very professional but also able to explain my diagnosis in a way that was easy to understand.

  2025-11-17

• Incredibly knowledgeable, kind, respectful physician

  2025-11-15

• Excellent. Was familiar with and recalled my history or had prepared well for the visit

  2025-11-08

• Dr Ellisen is great!

  2025-10-19

• Dr. Ellisen was awesome!

  2025-10-14

• Listens and provides excellent advise

  2025-09-28

• Dr. Leif Ellisen knows very well my medical history, he can well understand patient's felling and give the professional advice. I love this doctor very much

  2025-09-15

• Really knowledgeable and personable

  2025-09-15

• I've been going for follow ups with Dr. Ellisen for many years and he is always thorough, informative, and caring. One of the best doctors I've seen.

  2025-09-09