Marc D. Posner, MD

Marc D. Posner, MD

5.0 
414 ratings  Read Reviews
Northwestern Medicine logoNorthwestern Medical Group

Primary Specialty

Radiation Oncology

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Practice Website

Practice Focus Areas

This medical professional has a particular interest or expertise in:

Education

Medical Education:
MD, Harvard Medical School - 1995
Internship:
University of Chicago - 1995
Residency:
University of California (San Francisco) - 2000

Board Certifications

  • American Board of Radiology/Radiation Oncology - Radiation Oncology (Certified)

Faculty Profile

Clinical Assistant Professor, Feinberg School of Medicine

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Practice Groups and Affiliations

Medical Group:
Northwestern Medical Group
Alignment Category:
Northwestern Medicine Physician Network
On Medical Staff At:
Catherine Gratz Griffin Lake Forest Hospital
Grayslake Ambulatory Surgery Center

Ratings and Reviews

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Overall Rating

5.0
5.0 

414 Ratings

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Reviews from Patients

58 Reviews

Reviews from Patients

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58 Reviews

February 27, 2026

5.0

My first appointment with Dr M. Posner was on Feb 26,2026 He and his nurse Michele were wonderful/great. They were both very knowledgeable. I'm soooooo happy I chose NWH For all my medical needs. So I want to thank everyone for their service because they all are fantastic.

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February 27, 2026

5.0

Dr. Posner brings experience, competence and compassion to his practice.

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February 26, 2026

5.0

Dr Posner is awesome! He was so nice to my mom (the patient). Kind, patient, very informative and just plain caring! My mom and I love him! His staff is great also! I think it was Michelle who helped us, everyone was so nice!

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February 19, 2026

5.0

Very patient positive reassuring about treatment.

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February 13, 2026

5.0

The doctor explained everything well and made me feel comfortable

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February 12, 2026

5.0

Dr. Posner clearly cares about his patients. He takes the time to explain things in understandable terms and he his approach to avoiding unnecessary treatment is great.

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February 04, 2026

5.0

completely professional and honest

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February 04, 2026

5.0

All business, no bs

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February 04, 2026

5.0

He's honest!!

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February 03, 2026

5.0

Covers all questions and makes me feel safe

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February 03, 2026

5.0

Going threw the process not disappointed for care recived.lucky to doctor on my chart. Thanks

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January 21, 2026

5.0

Gave willingly of his time, made me feel extremely comfortable during a stressful time,explained things really well, very personable

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January 20, 2026

5.0

He makes sure you understand what's going on with the process.

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January 19, 2026

5.0

He is very knowledgeable, patient and explained my upcoming radiation treatment in full detail.

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January 04, 2026

5.0

The doctor was very thorough, understanding, and talk to us in a way that we could understand

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December 24, 2025

5.0

Excellent emotional support

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December 22, 2025

5.0

He's the best doctor I've ever had.

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December 16, 2025

5.0

Very professional, caring and knowledgeable

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December 11, 2025

5.0

Same plus prompt response

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November 22, 2025

5.0

Same as above - an awesome knowledgeable physician.

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November 20, 2025

5.0

He is so kind, knowledgeable, and patient. He spent the time to answer every question. I know I have the best team treating me!

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November 18, 2025

5.0

Dr. Posner took time both to listen to my concerns and to share his invaluable knowledge. I take my health seriously. It's clear that Dr. Posner does too. I'm confident with the medical decisions I've made, because of his candor and expertise. I'm truly grateful to call Dr. Posner my radiologist.

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November 14, 2025

5.0

Dr. Posner is not only an expert in his field, he is a kind and caring doctor. He takes time to answer all questions, and makes you feel completely comfortable. A true bright spot in my cancer journey.

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November 14, 2025

5.0

Very friendly. Took the time to answer my questions and explain my options and treatment plans.

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November 12, 2025

5.0

I really like his style

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November 08, 2025

5.0

he knowledgeable and concerned about my cancer treatment and helped put my mind at ease.

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November 06, 2025

5.0

Listened attentively. Fully explained any and all procedures. An affable person.

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October 27, 2025

5.0

I had my first appointment with Dr. Posner and I was truly impressed. He took the time to explain everything in detail to me and my husband, he answered all of our questions with patience, and made me feel completely at ease. His kindness and compassion really stood out, and I left the appointment feeling informed, supported, and confident about my treatment plan. I'm so grateful to have him as my radiation oncologist.

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October 23, 2025

5.0

Wow, Dr Posner was the right choice for me as he is so extremely knowledgeable, kind and caring. I knew I had the best doctor for me when I met with him and knew I was in trusted hands throughout my treatments. When I had a small hiccup after my treatments were completed,I got an appointment right away and he reassured me that the soaking treatments etc would help immensely. He was so right and appreciate his knowledge and caring and the exceptional team he has. I would highly recommend him!

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October 06, 2025

5.0

Like personality, Honsty and Plain tal visit with time for questions.

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October 04, 2025

5.0

Puts me at ease

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October 02, 2025

5.0

He was very compassionate and explained the pros and cons thoroughly

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September 26, 2025

5.0

Super doctor! Came to out 1st meeting totally prepared, having reviewed all prior medical records & completed his own detailed analysis of CT scans. Explained end-to-end radiation process, listened carefully to questions, & answered in very easy-to-understand, plain English.

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September 21, 2025

5.0

He was friendly, knowledgeable and had clearly read my biopsy results before we met. And he gave me good news!

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September 19, 2025

5.0

Kind. Informative. Easy to speak with & ask questions.

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September 18, 2025

5.0

Well he gets to the heart of the matter let me know what is really going on and that is a good thing thank you

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September 13, 2025

5.0

They treated me very kindly and explained the radiation process to me.

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September 12, 2025

5.0

Totally professional.

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September 11, 2025

5.0

Very caring doctor who takes the time to explain things in language you can understand

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September 08, 2025

5.0

I respect Dr Posner for my care

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August 30, 2025

5.0

Dr Posner was so kind and explained everything and very positive and supportive

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August 19, 2025

5.0

Marc really cares about his patients......not just their health, but is truly invested in all aspects of his patients. He's easy to talk to and willing to spend as much time as you want to talk about your treatment, answer your questions of just shoot the bull. His positive attitude goes along way at putting you at ease.

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August 12, 2025

5.0

Intelligent friendly caring By far the best

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August 07, 2025

5.0

Dr. Posner is a wonderful and compassionate doctor. I felt i was in great hands under his care.

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August 01, 2025

5.0

Loved him

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July 31, 2025

5.0

He steered me through what could have been a difficult procedure and delivered a fantastic result. I cannot make enough positive comments about him and his team. I would heartily recommend Dr. Posner to anyone who required radiation therapy.

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July 30, 2025

5.0

Wonderful doctor!!!

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July 19, 2025

5.0

Straightforward questions and answers. Very good availability

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June 25, 2025

5.0

Very friendly, answers all your questions, explains using language without special medical terms, spends as much time as you need, offers to ask him questions in MyChart even if you do not confirm that you are planning to do procedure with him, understanding that the hospital does not have all types of equipment.

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June 20, 2025

5.0

Professional, kind, respectful

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June 19, 2025

5.0

He explained the treatment in detail and took the time to answer all my questions

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June 03, 2025

5.0

Very caring magnanimous individual He immediately makes you feel comfortable and not intimidated by his position and expertise.

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May 30, 2025

5.0

Confidence in Dr Posner

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May 30, 2025

5.0

Knowledgeable, caring, responsive.

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May 13, 2025

5.0

He was knowledgeable and professional and personable

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May 07, 2025

5.0

Doctor Posner connects with people in a very genuine, comfortable way. I've never had a doctor as wonderful as Doctor Posner. Never!

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May 03, 2025

5.0

So impressed with Dr. Posner's kindness, empathy, and the relaxed and conversational manner he explained things. He took so much time with us and I really appreciate that. I really feel like I'm in great hands with him.

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May 02, 2025

5.0

We had a consult appointment. He explained the procedure clearly and completely. Answered questions and I thought his manner was very reassuring.

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Disclosures

Industry Relationships

Consulting

Faculty member and/or their immediate family have engaged in activities such as speaking, advising, consulting, or providing educational programs for the following companies or other entities

  • Elekta

External Professional Relationships

Pharmaceutical, device, and biotechnology companies frequently collaborate with basic scientists and physicians within an academic medical center to help advance science and improve patient care. These relationships are important in achieving scientific breakthroughs and in establishing the effectiveness and safety of promising new therapies. In order to assure objectivity in clinical research and patient care, the Northwestern University Feinberg School of Medicine (Feinberg), Northwestern Memorial HealthCare, Children's Hospital of Chicago Medical Center, and the Shirley Ryan AbilityLab have adopted integrity policies that require research and clinical faculty (in full-time, part-time, and unpaid/voluntary categories) to report compensated and uncompensated external industry relationships. Patients are encouraged to discuss these disclosures with their physician as well as to inquire as to how these relationships are overseen by Feinberg. To learn more about our Disclosure and Professional Integrity Policy, and the conflict of interest policies of our joint affiliate survey partners, please go to our Office for Regulatory Affairs Policies page.

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