About

About

I am a board certified medical oncologist treating all solid tumor malignancies, with special expertise in head and neck and gastrointestinal malignancies. I am the Director of Medical Oncology at Northwell Health Cancer Institute, Imbert Cancer Center. I collaborate with a multidisciplinary team of physicians, surgeons, radiation oncologists, pathologists, and radiologists to bring the best possible care to patients who wish to be treated close to home on Long Island. I am also an attending physician of the Don Monti Division of Medical Oncology and Hematology at North Shore University Hospital, Long Island Jewish Medical Center and Southside Hospital. Prior to joining Northwell Health, I was an attending physician at Memorial Sloan Kettering Cancer Center. I completed my Internal Medicine residency training at Maimonides Medical Center and my fellowship in Hematology and Oncology at the University of Vermont. In addition to my work as a clinician, I have a strong interest in clinical research. I immensely enjoy teaching and have mentored many young physicians during their training. I am proud to be part of a dedicated multidisciplinary team, providing state- of-the-art comprehensive care to all of our patients on Long Island.

Credentials

Credentials

  • Board certifications

    • Medical Oncology - American Board of IM/Medical Oncology

  • Academic titles

    • Assistant Professor, Donald and Barbara Zucker School of Medicine at Hofstra/Northwell

  • Medical school

    • St Georges Univ School of Medicine

  • Residencies

    • Maimonides Medical Center

  • Fellowships

    • Fletcher Allen Health Care / University of Vermont

  • Affiliations

Locations & insurance

Locations & insurance

Insurance information

Don't be surprised

Learn how you can avoid unanticipated medical bills

Learn more about medical bills

Patient ratings & comments

Patient ratings & comments

Unlike websites where anyone can post doctor reviews, only actual patients can provide information by completing the survey sent to them by Press Ganey. Learn more.

4.9 out of 5 4.9 out of 5 rating
| 104.0 patient ratings & 18 patient comments

Friendliness/courtesy of the care provider

4.9 out of 5 4.9 out of 5 rating

Explanations the care provider gave you about your problem or condition

4.9 out of 5 4.9 out of 5 rating

Concern the care provider showed for your questions or worries

4.9 out of 5 4.9 out of 5 rating

Care provider's efforts to include you in decisions about your treatment

4.9 out of 5 4.9 out of 5 rating

Information the care provider gave you about medications(if any)

4.9 out of 5 4.9 out of 5 rating

Instructions the care provider gave you about follow up care (if any)

4.9 out of 5 4.9 out of 5 rating

Degrees to which care provider talked with you using words you could understand

4.9 out of 5 4.9 out of 5 rating

Amount of time the care provider spent with you

4.9 out of 5 4.9 out of 5 rating

Your confidence in this care provider

4.9 out of 5 4.9 out of 5 rating

Likelihood of your recommending this care provider to others

4.9 out of 5 4.9 out of 5 rating

Most recent comments

Patient comments are gathered from the Press Ganey Pateint Satisfaction Survey. Comments are displayed in their entirety and are anonymous for patient privacy.

07/08/2018
"Thanks and may God bless you all."
06/28/2018
"Amazing doctor."
05/29/2018
"Dr Siebel is one of the best people in the world,there is nothing negative I can ever say about her."
04/30/2018
"Dr. Siegel is a caring, wonderful doctor who is reassuring and informative. absolutely love her!"
04/17/2018
"Dr. Siebel is an amazing oncologist who has gone above and beyond my expectations!"
03/12/2018
"Meeting was rushed after long wait. Discussion of test results was short (PET scan)."
02/15/2018
"Dr. Siebel is very caring, professional & nice. Thank you."
01/26/2018
"1-10. Exceptional."
01/25/2018
"Very good."
01/25/2018
"I have complete confidence in all of the Drs & staff."
01/04/2018
"I have all confidence in her that I followed her from her prior place of employment."
11/01/2017
"Dr. Siebel is wonderful. She is caring and goes beyond to help."
10/30/2017
"I can't imagine tackling my cancer problem without dr Seibol. I feel very encouraged every time I meet with her. She is a strong communicator and I know where I stand after every visit. Dr Seibol also spends the time to explain everything going on to my daughters. Dr seibol is a credit to your organization"
10/27/2017
"Dr. Siebel is great!!"
10/27/2017
"Dr. Siebel is THE BEST!!!"
10/04/2017
"Dr. Siebel is kind and caring she gave me a list of the next steps. Will recommend her to people who may need her. "
06/06/2017
"Very satisfying experience."
08/22/2016
"The best oncologist. Know - lots of research to find the best."

In the news

In the news

In the news
Screenings and vaccinations have helped reduce cancer deaths. Marisa Siebel, MD, provides insight.