Highlights
Age Groups Seen
- Adult
Languages
- English
Gender
MaleEducation & Board Certifications
Education
- Fellowship: Cleveland Clinic, 2019
- Residency: Cleveland Clinic, 2018
- Medical Education: Lake Erie College of Osteopathic Medicine, 2014
- Undergraduate: Kent State University, 2010
Board Certifications
- Neurology: American Board of Psychiatry & Neurology, 2018
Research & Publications
See publications for this provider. (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
Cleveland Clinic physicians and scientists collaborate with industry to advance medical breakthroughs. These partnerships help commercialize discoveries for public benefit while maintaining scientific integrity. To ensure transparency and minimize potential bias, Cleveland Clinic reviews these relationships and publicly discloses when physicians/scientists receive significant compensation for consulting, serve in fiduciary roles, receive royalties, or hold equity interests related to their work. We manage potential conflicts through approval processes, annual reporting, and targeted management plans.
As of 2025-12-08, Dr. Marquardt 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.
Insurances Accepted
Ratings & Reviews
4.9 out of 5
107 ratings, 17 reviewsThe 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.
- 5 out of 5 starsReviewed on 3/6/2026
He was very professional, but also friendly & explained everything so I understood. I''m very thankful he''s my doctor.
- 5 out of 5 starsReviewed on 2/20/2026
Do everything you can to keep Dr Marquardt
- 5 out of 5 starsReviewed on 2/5/2026
I had a video appointment and as usual, my appointment with Dr Marquardt went very well. He did an excellent job of explaining things and answering my questions. He is very thoughtful and definitely made me feel part of the decision making. I feel very fortunate to have him as my neurologist.
- 5 out of 5 starsReviewed on 1/27/2026
Dr. Marquardt made me feel comfortable, respected. He listened carefully, explained things clearly, and answer my questions thoroughly.
- 5 out of 5 starsReviewed on 1/14/2026
Dr. Marquardt was probably the best physician I've ever seen. Highly impressed.
- 5 out of 5 starsReviewed on 11/13/2025
Dr Marquardt was very caring and kind.
- 5 out of 5 starsReviewed on 10/16/2025
Terrific doctor
- 5 out of 5 starsReviewed on 10/9/2025
Dr. Marquardt was great in all respects! It was just difficult to get an appointment.
- 5 out of 5 starsReviewed on 10/8/2025
Doctor listened to me which I thoroughly appreciated.
- 5 out of 5 starsReviewed on 8/4/2025
Actually excellent not very good. Dr. Marquardt was in charge all the way. Well prepared personable, professional. I was comfortable that I was in great hands .
- 5 out of 5 starsReviewed on 8/4/2025
The doctor was thorough and clarity.He also gave me hope.
- 5 out of 5 starsReviewed on 7/2/2025
Actually saw Dr. Marquart
- 5 out of 5 starsReviewed on 7/2/2025
The Fellow and doctor were very thorough and caring. They provided thorough answers and explanations to all of my questions. It was a very hood experience.
- 5 out of 5 starsReviewed on 6/23/2025
Doctor was very informative and presented options including strength of dosage
- 5 out of 5 starsReviewed on 6/23/2025
All my expectations were met and more. Dr. Marquardt was engaged, a good listener and very knowledgeable. He made me feel at ease and answered all my question in a way that was understandable. Very pleased with this visit.
- 5 out of 5 starsReviewed on 5/22/2025
Dr. Marquardt Has to personally make arrangements to fit me in his schedule because our time zone is six hours behind Cleveland. He's a phenomenal doctor. I'm so grateful he's kept me as a patient, Especially Given the scheduling complications
- 5 out of 5 starsReviewed on 5/22/2025
Exceptional doctor, Truly best or the best