Ari Grinspan, MD
img_Ari Grinspan
ASSOCIATE PROFESSOR | Medicine, Gastroenterology
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Specialties
Gastroenterology
Fecal Microbiota Transplantation (FMT)
Dr. Grinspan has pioneered the Fecal Microbiota Transplantation (FMT) program at Mount Sinai to treat recurrent and refractory Clostridium difficile infection.

MD, Albert Einstein College of Medicine

Residency, Internal Medicine, New York Presbyterian Hospital-Weill Cornell

Fellowship, Gastroenterology, Mount Sinai Hospital

Certifications

American Board of Internal Medicine

2013

Chief GI Fellow

Mount Sinai Medical Center

2011

Daniel M. Libby MD Program Directors Award

New York-Presbyterian Hospital

2010

Assistant Chief Resident

New York-Presbyterian Hospital

2008

Alpha Omega Alpha

Albert Einstein College of Medicine

2004

Phi Beta Kappa

University of Pennsylvania

Publications

Selected Publications

Long-read metagenomics for strain tracking after faecal microbiota transplant. Yu Fan, Mi Ni, Varun Aggarwala, Edward A. Mead, Magdalena Ksiezarek, Lei Cao, Michael A. Kamm, Thomas J. Borody, Sudarshan Paramsothy, Nadeem O. Kaakoush, Ari Grinspan, Jeremiah J. Faith, Gang Fang. Nature Microbiology

Credible inferences in microbiome research: ensuring rigour, reproducibility and relevance in the era of AI. Alberto Caminero, Carolina Tropini, Mireia Valles-Colomer, Dennis L. Shung, Sean M. Gibbons, Michael G. Surette, Harry Sokol, Nicholas J. Tomeo, Michelle Clark, Long H. Nguyen, Mark Pimentel, Alejandro Reyes Muñoz, Ryan Ranallo, Rohit Loomba, Purna Kashyup, Aaron L. Hecht, Lori R. Holtz, Diane E. Hoffmann, Ari Grinspan, Sara C. Di Rienzi, Muyiwa Awoniyi, Theresa Alenghat, Phillip I. Tarr, Elena F. Verdu. Nature Reviews Gastroenterology and Hepatology

Author Correction: Gut microbiota strain richness is species specific and affects engraftment (Nature, (2025), 637, 8045, (422-429), 10.1038/s41586-024-08242-x). Alice Chen-Liaw, Varun Aggarwala, Ilaria Mogno, Craig Haifer, Zhihua Li, Joseph Eggers, Drew Helmus, Amy Hart, Jan Wehkamp, Esi S.N. Lamousé-Smith, Robert L. Kerby, Federico E. Rey, Jean Frédéric Colombel, Michael A. Kamm, Bernat Olle, Jason M. Norman, Rajita Menon, Andrea R. Watson, Emily Crossette, Elisabeth M. Terveer, Josbert J. Keller, Thomas J. Borody, Ari Grinspan, Sudarshan Paramsothy, Nadeem O. Kaakoush, Marla C. Dubinsky, Jeremiah J. Faith. Nature

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Fecal Microbiota Transplantation
The Power of Poop — AMNH SciCafe

Physicians and scientists on the faculty of the Icahn School of Medicine at Mount Sinai often interact with pharmaceutical, device, biotechnology companies, and other outside entities to improve patient care, develop new therapies and achieve scientific breakthroughs. In order to promote an ethical and transparent environment for conducting research, providing clinical care and teaching, Mount Sinai requires that salaried faculty inform the School of their outside financial relationships.

Dr. Grinspan has not yet completed reporting of Industry relationships.

Mount Sinai's faculty policies relating to faculty collaboration with industry are posted on our website. Patients may wish to ask their physician about the activities they perform for companies.