Emergency icon Important Updates
Department Radiation Oncology
Primary Location Weston Hospital
Type of Doctor Adults Only
Languages English
Surgeon No
Weston Hospital
Primary Location

Weston Hospital

Specialties & Treatments

Treatment & Services

  • Adult Neuro-Oncology
  • Biologically Targeted Radiotherapy
  • Body Radiosurgery
  • Brachytherapy
  • Brain Tumor Management
  • Cancer Center
  • Cancer Screening
  • Cancer Supportive Care
  • Clinical Trials
  • Cranial Radiosurgery
  • Esophageal Brachytherapy
  • External Beam Radiotherapy
  • Fractionated Radiotherapy
  • Hyperfractionated Radiation Therapy
  • Image-Guided Radiation Therapy
  • Intensity Modulated Radiation Therapy
  • Lung Stereotactic Body Radiotherapy
  • New Experimental Treatment Technologies
  • Partial Breast Irradiation
  • PET in Tumors
  • Radiation Oncology
  • Radiation Sensitizers
  • Radiation Therapy
  • Radiation Therapy in the Treatment of Breast Cancers
  • Radioimmunotherapy
  • Radiotherapy
  • Stem Cell Transplant
  • Stereotactic Body Radiation Therapy (SBRT)
  • Stereotactic Radiosurgery
View all 29 Treatment & Services +

Specialty in Diseases & Conditions

  • Acoustic Neuroma
  • Adrenal Cancer
  • Adrenal Tumors
  • Adult Brain Tumors
  • Ampullary Cancer
  • Ampullary Carcinoma
  • Anal Cancer
  • Anaplastic Astrocytomas
  • Anaplastic Oligodendrogliomas
  • Anaplastic Thyroid Cancer
  • Angiosarcomas
  • Askin’s Tumors
  • Astrocytoma
  • Benign Brain Tumors
  • Benign Tumors of the Spinal Cord
  • Bile Duct Cancer
  • Bladder Cancer
  • Brain Cancer
  • Brain Lymphoma
  • Brain Metastases
  • Breast Cancer
  • Cancer
  • Cavernous Sinus Tumors
  • Central Nervous System (CNS) Malignancies
  • Cervical Cancer
  • Chest Wall Sarcomas
  • Chordomas
  • Clival Chordomas
  • Colon Cancer
  • Colorectal Cancer
  • Dupuytren's Disease
  • Endometrial Cancer
  • Ependymomas
  • Epithelioid Hemangioendothelioma (EHE)
  • Esophageal Cancer
  • Gallbladder Cancer
  • Gastrointestinal Malignancies
  • Gastrointestinal Stromal Tumors (GIST)
  • Genitourinary Cancers
  • Glioblastoma Multiforme
  • Gynecologic Malignancies
  • Head and Neck Cancer
  • Hemangioblastomas
  • Hematologic Malignancies
  • Heterotopic Ossification
  • Histologic Variants of Bladder Cancer
  • Hodgkin's Disease
  • Hypopharyngeal Cancer
  • Invasive Thyroid Cancer
  • Islet Cell Cancer
  • Kidney Cancer
  • Large Intestine Cancer
  • Laryngeal Cancer
  • Lip and Oral Cavity Cancer
  • Liver Cancer
  • Liver Tumors
  • Lung Cancer
  • Lymphedema
  • Lymphoma
  • Malignant Gliomas
  • Malignant Tumors of the Spinal Cord
  • Medullary Thyroid Carcinoma
  • Melanoma
  • Meningioma
  • Merkel Cell
  • Mesothelioma
  • Metastatic Cancer
  • Minor Salivary Gland Cancer
  • Mouth Cancer
  • Myeloma
  • Nasal Cavity Cancer
  • Nasopharyngeal Cancer
  • Natural Killer (NK) Cell Leukemia
  • Natural Killer Cell Leukemia
  • Natural Killer Cell Lymphoma
  • Non-Clear Cell Kidney Cancer
  • Non-Hodgkin's Lymphoma
  • Ocular Lymphomas
  • Ocular Metastasis
  • Oligodendroglioma
  • Ophthalmic Tumors
  • Oral Cancer
  • Oropharyngeal Cancer
  • Osteosarcoma
  • Ovarian Cancer
  • Pancreatic Cancer
  • Parotid Cancer
  • Parotid Tumors
  • Penile Cancer
  • Pituitary Tumors
  • Plantar Fibroma
  • Plantar Fibromatosis
  • Pleura Cancer
  • Primary Central Nervous System (CNS) Lymphomas
  • Primary Soft Tissue Sarcomas of the Chest Wall
  • Prostate Cancer
  • Radiation Induced Chest Wall Sarcomas
  • Radioactive Iodine Refractory Differentiated Thyroid Cancer (RAIR DTC)
  • Rectal Cancer
  • Recurrent Thyroid Cancer
  • Renal Pelvis Cancer
  • Retinal Hemangioma
  • Retinoblastoma
  • Salivary Gland Cancer
  • Salivary Gland Diseases
  • Sarcoma
  • Sarcomas of the Brain or Head
  • Schwannoma
  • Sinonasal Cancer
  • Sinonasal Tumors
  • Skin Cancer
  • Skull Base Cancer
  • Soft Tissue Sarcoma
  • Spinal Cancer
  • Spinal Metastases
  • Spine Tumors
  • Squamous Cell Carcinoma
  • Stomach Cancer
  • Submandibular Gland Cancer
  • T-Cell Lymphoma
  • Testicular Cancer
  • Thoracic Cancer
  • Thoracic Tumors
  • Thymic Cancer
  • Thymic Tumors
  • Thymoma
  • Thyroid Cancer
  • Thyroid Tumor
  • Transitional Cell Cancer
  • Trigeminal Neuralgia
  • Unknown Origin Cancer
  • Upper Tract Urothelial Carcinomas (UTUC)
  • Ureteral Cancer
  • Urethral Cancer
  • Urinary Cancer
  • Urothelial Cancer
  • Uterine Cancer
  • Uveal Melanoma
  • Vaginal Cancer
  • Vulvar Cancer
View all 140 Specialties +


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Education & Professional Highlights

Education & Professional Highlights


Education & Fellowships

Fellowship - Cleveland Clinic
Radiation Oncology; Radiosurgery; Thoracic Oncology
Cleveland, OH USA

Residency - Cleveland Clinic
Radiation Oncology
Cleveland, OH USA

Residency - University Hospitals of Cleveland
Radiation Oncology
Cleveland, OH USA

Internship - Riverside Methodist Hospital
Internal Medicine; Preliminary Medicine
Columbus, OH USA


  • Radiation Oncology

Specialty Interests

Radiation therapy, head and neck cancer, esophageal cancer, intensity modulated radiation therapy (IMRT), image-guided radiation therapy (IGRT), adaptive radiation therapy, PET-guided therapy, high dose-rate (HDR) brachytherapy, stereotactic body radiation therapy, technical innovation

Innovations & Patents

  • Multichannel, Esophageal Brachytherapy Applicator
    U.S. Provisional, Serial No.: 61/777,671
Research & Publications

Research & Publications

See publications for John Greskovich, Jr., MD.

(Disclaimer: This search is powered by PubMed, a service of the U.S. National Library of Medicine. PubMed is a third-party website with no affiliation with Cleveland Clinic.)

Industry Relationships

Industry Relationships

Cleveland Clinic physicians and scientists may collaborate with the pharmaceutical or medical device industries to help develop medical breakthroughs or provide medical expertise or education. Cleveland Clinic strives to make scientific advances that will benefit patient care and support outside relationships that promise public benefit. In order for the discoveries of Cleveland Clinic physicians' and scientists' laboratories and investigations to benefit the public, these discoveries must be commercialized in partnership with industry. As experts in their fields, Cleveland Clinic physicians and scientists are often sought after by industry to consult, provide expertise and education.

To assure professional and commercial integrity in such matters, Cleveland Clinic maintains a program that reviews these collaborations and, when appropriate, puts measures in place to minimize bias that may result from ties to industry. Cleveland Clinic publicly discloses the names of companies when (i) its physicians/scientists receive $5,000 or more per year (or, in rare cases, equity or stock options) for speaking and consulting, (ii) its physicians/scientists serve as a fiduciary, (iii) its physicians/scientists receive or have the right to receive royalties or (iv) its physicians/ scientists hold any equity interest for the physician's/scientist's role as inventor, discoverer, developer, founder or consultant.* In publicly disclosing this information, Cleveland Clinic tries to provide information as accurately as possible about its physicians' and scientists' connections with industry.

As of 4/3/2023, Dr. Greskovich, Jr. has reported no financial relationship with industry that is applicable to this listing. In general, patients should feel free to contact their doctor about any of the relationships and how the relationships are overseen by Cleveland Clinic. To learn more about Cleveland Clinic's policies on collaborations with industry and innovation management, go to our Integrity in Innovation page.

Public Health Service-Reportable Financial Conflicts of Interest. Cleveland Clinic scientists and physicians engage in basic, translational and clinical research activities, working to solve health problems, enhance patient care and improve quality of life for patients. Interactions with industry are essential to bringing the researchers' discoveries to the public, but can present the potential for conflicts of interest related to their research activities. Click here to view a listing of instances where Cleveland Clinic has identified a Public Health Service (PHS)-Reportable Financial Conflict of Interest and has put measures in place to ensure that, to the extent possible, the design, conduct and reporting of the research is free from bias.

* Cleveland Clinic physicians and scientists subscribe to the guidance presented in the PhRMA Code on Interactions with Healthcare Professionals and the AdvaMed Code of Ethics on Interactions with Health Care Professionals. As such, gifts of substantial value are generally prohibited.

Patient Satisfaction Reviews

256 Patient Satisfaction Reviews

The Patient Satisfaction Rating is an average of all responses to the care provider related questions shown below from our nationally-recognized Press Ganey Patient Satisfaction Survey. Patients that are treated in outpatient or hospital environments may receive different surveys, and the volume of responses will vary by question.

Responses are measured on a scale of 1 to 5 with 5 being the best score.

The comments are submitted by patients and reflect their views and opinions. The comments are not endorsed by and do not necessarily reflect the views of Cleveland Clinic.

Overall Star Ratings
4.9 out of 5
Explains 4.9
Courtesy, Respect & Concern 4.9
Patient Rating of Doctor 4.9

51 Patient Comments

Reviewed on Jan 22, 2024

Dr. Greskovich is a Champion of Great Medical Care and very supportive!!!

Reviewed on Jan 17, 2024

He is a great doctor

Reviewed on Jan 9, 2024

Dr. G is one of the best radiologist he's always pleasant and he always go above and beyond to make my mom feel very comfortable could not have asked for a better team

Reviewed on Dec 28, 2023

Great doctor

Reviewed on Dec 6, 2023

Dr.G takes time to explain everything and makes me feel extremely comfortable and confident. CC is lucky to have such a talented Dr.

Reviewed on Dec 4, 2023

I like Dr Greskovich. He is positive. You can tell when he talks, he talks with knowledge and experience A total asset to your line up of drs

Reviewed on Dec 1, 2023

I am so happy and pleased that I selected Cleveland Clinic for my care and medical treatment for my doctor Dr G. Is the best and recommend him very highly and I was so fortunate to have him as my primary physician. Thank You Dr G.

Reviewed on Nov 21, 2023

I am so blessed I have Dr. Greskovich as my oncologist. He Is compassionate, a great listener to my questions and my concerns. It's a scary situation having cancer, I feel like he is there for me in every way.

Reviewed on Nov 16, 2023

Dr Greskavich always goes above and beyond any expectations I m have. Answer all questions. Has done this for the last 4 years

Reviewed on Nov 14, 2023

Dr. Greskowitch is so human and he is gifted with such patience. He gives you hope during these trying times.

Reviewed on Nov 8, 2023

Dr. Greskovitch is wonderful. He always listens to my concerns and answers all my questions. I would definitely recommend him.

Reviewed on Oct 25, 2023

Dr "G" is awesome

Reviewed on Oct 17, 2023

Dr G was outstanding and very personable

Reviewed on Oct 4, 2023

All the doctors are sympathetic to your issues. They are very descriptive on your treatment and any risks involved. They seem to be good about communicating with your other Doctors. A+

Reviewed on Sep 27, 2023

Dr. G is an awesome doctor when talking to him he is very easy to follow and understand.

Reviewed on Sep 26, 2023

Dr G is not only an excellent doctor but a very caring person.He cares about his patients, which is very important for me

Reviewed on Sep 13, 2023

Cleveland Clinic health providers are top notch

Reviewed on Aug 25, 2023

Dr. Greskovich and his staff are THE BEST. Courteous, efficient, friendly. I could go on and on. Love them

Reviewed on Aug 25, 2023

Extremely happy with the Doctor and his entire staff

Reviewed on Aug 24, 2023

He is a spectacular doctor and you are a great Hospital

Reviewed on Aug 21, 2023

Dr. Greskovich is a great doctor, he's kind, compassionate and really sees you as a person. He listens to you, you never feel rushed and he answers all your questions.

Reviewed on Aug 15, 2023

Dr.Greskovich is a too optimistic a physician.

Reviewed on Aug 15, 2023

I am truly blessed to have Dr. Greskovich as my doctor! He sincerely cares about his patients and I always feel like I am part of the 'family" when I visit his office. He is compassionate and listens to and answers all my questions with compassion. I would recommend him to anyone!

Reviewed on Aug 14, 2023

Dr. Greskovich is the best and his staff is also the best!

Reviewed on Aug 10, 2023

I am extremely happy with Dr Greskovigh. He is understands my concerns and is very courteous and respectful.

Reviewed on Aug 8, 2023

Dr. G, is a total care giver. He demonstrated his training ,humanity ,and knowledge making sure my entire recovery is successful.

Reviewed on Aug 8, 2023

Dr Greskovich has always been attentive to my concerns, truly knowledgeable and always makes suggestions to my overall health.

Reviewed on Aug 8, 2023

Excellent Dr and great staff

Reviewed on Jul 28, 2023

I'm unable to get an appointment with my primary care doctor, Hermann Stubbe, without either waiting for 3 months or seeing a physician assistant which is unacceptable.

Reviewed on Jul 27, 2023

What great Doctor makes you so comfortable to talk to

Reviewed on Jul 27, 2023

An absolute Excellent Dr G you should be honored to have him

Reviewed on Jul 24, 2023

Great doctor

Reviewed on Jul 14, 2023

Outstanding physician

Reviewed on Jun 28, 2023

I basically had minimal questions due too the fact that the provider was so informative in explaining every detail that I would be in countering in the entire process of my treatment and care in would be receiving left me with the thought that I made the right decision of choosing Cleveland clinic over other cancer institutions.

Reviewed on Jun 28, 2023

There's no way I could recommend any other hospital or cancer institutions over Cleveland clinic. Dr. Greskovick exceeded my expectations of him and his staff as well and the administration and respect they have for Dr. G.

Reviewed on Jun 7, 2023

Your personal from the front desk to the nurses and Doctors were super professional and courteous.

Reviewed on Jun 7, 2023

I never give five across-the-board, but in this instance, I could not fine a higher score to give, I am truly grateful that I selected Cleveland Clinic for my care and it all started with Dr. Trosman and Dr. Greskovick and the outstanding team they have assembled and have working with them.

Reviewed on Jun 1, 2023

Dr. Greskovich what can I say ALL thumbs UP!

Reviewed on May 25, 2023

Wonderful Doctor and staff

Reviewed on May 15, 2023

He's an outstanding doctor and human.

Reviewed on May 11, 2023

Dr.Greskovich has always sat with me for as long as I needed. He never rushed me, and he answered all my questions. Would highly recommend him.

Reviewed on May 10, 2023

Happy to keep seeing doctor Greskovich for as long as I'm in surveillance after treatment.

Reviewed on May 8, 2023

Dr. Greskovich, Dr. G, is simply the Best! More than my Doctor, he has consistently listened to my hopes and fears, providing counseling and treatment guidance to me and my husband, been our friend thru some extraordinarily difficult times. We Love and Respect him tremendously. He gets it!

Reviewed on May 8, 2023

No bad experiences at ALL! Dr. G and the entire Staff provide an environment that encourages and promotes wellbeing. They Listen.

Reviewed on May 4, 2023

The best front desk of any doctor

Reviewed on May 4, 2023

Dr G is the best

Reviewed on May 2, 2023

Dr. Greskovich is super.

Reviewed on May 1, 2023

What more can I say about the best doctor for me at this moment in my life. Than thank you

Reviewed on Apr 25, 2023

Dr. G is the best!

Reviewed on Apr 25, 2023

Dr. Greskovich is a caring professional

Reviewed on Apr 21, 2023

Seen by Dr. "G". Super guy.

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