Gregory Grimberg, MD

“I had the privilege to work under the tutelage of Dr. John G. Kral in medical school, who inspired both my passion for surgery and passion to combat the growing obesity epidemic. Presenting my research at The Obesity Society and ASMBS conferences in Boston and Atlanta exposed me to novel concepts in obesity research with clinicians and basic scientists around the world. Throughout my surgical residency, I have strived to attain mastery in pre-operative, post-operative care, and optimal surgical technique in open, laparoscopic and robotic surgery. I have had the pleasure to perform many advanced laparoscopic, robotic and bariatric surgeries at Hackensack University Medical Center. The centers expertise in bariatric surgery along with the high volume of cases, has also allowed me to perform extensive data analysis and outcomes research to further improve patient centered care. During my Bariatric Surgery Fellowship at Johns Hopkins University, I have performed primary, revisional and emergency Bariatric Surgery under the guidance of Dr. Michael A. Schweitzer, a worldwide leader in innovative Bariatric Surgery.
Throughout my medical training and in my personal life, I have met people who suffered from obesity and its many co-morbidities. The changes that Bariatric surgery is able to provide these patients is awe-inspiring. Patients who were previously bedridden are now able to go back to work and play catch with their grandchildren in the park. Those affected by multiple medical problems now have to take few, if any medications daily and their long-term survival is improved. The miracle of Bariatric surgery is the long-term lifestyle changes that the patients can learn to maintain afterwards due to change in physiology. No other single surgical procedure can potentially cure so many chronic medical conditions! Taking a direct part in the pre-operative and post-operative care of these patients has shown me that this is a unique population with its own set of challenges, but it gives me great personal and professional satisfaction to assist them with this transformation.
Minimally Invasive Surgery is a field that is constantly innovating, incorporating new devices, technology and techniques in order to improve patient outcomes and push the boundaries of feasibility.”

Contact Info

Phone: (641) 428-2400

Visit Website    

910 N Eisenhower Ave
Mason City, 50401

Procedures Performed

  • Cholecystectomy (Gallbladder)
  • Foregut Surgery
  • Gastric Bypass
  • Gastric Plication
  • Gastric Sleeve
  • GERD (Acid Reflux) Surgery
  • Hiatal Hernia Repair
  • Revisional Surgery


  • American Board of Surgery
  • American College of Surgeons
  • American Society for Metabolic and Bariatric Surgery
  • Center of Excellence
  • Society of American Gastrointestinal Endoscopic Surgeons

Insurance Accepted

  • *Call office for details


  • Posters Placental 11β-Hydroxysteroid Dehydrogenase Activity and Cord Serum Cortisol Levels in Obesity. Edesiri Akajagbor, Gregory Grimberg, Mudar Dalloul, John Kral and Vijaya Lakshmi Nacharaju Poster presented at ENDO 2015 (Endocrine Society’s 97th Annual Meeting & Exposition), San Diego, CA, March 5-8, 2015. Outcomes of Oncologic Resection and Subsequent Reconstruction of Major Defects. Walsh K, Grimberg G, Scholer A, Lynch L, Keith J, Chokshi R. ASC 2017 (American Surgical Congress) 82.08 Las Vegas, NV Feb 7-9, 2017.
  • Cord serum cortisol and fetal-placental weight in mothers with prevalent severe obesity. Grimberg G, Dhariwal L, Arya S, Dalloul M, Muneyyirci-Delale O, Nacharaju VL, Kral JG. Abstract submitted to the International Association for the Study of Obesity (IASO) and The Obesity Society (TOS) and a poster presented at the hot topics conference on obesity and pregnancy meeting, Boston, MA, May 2013.
  • Gestational Stress and Obesity: Cortisol and Gonadal Steroids in the Maternal-Fetal Unit. Grimberg G, Dhariwal L, Arya S, Dalloul M, Muneyyirci-Delale O, Nacharaju VL, Kral JG. Oral Presentation and Abstract, Presented at 31st Annual Scientific Meeting of The Obesity Society 2013. The American Society for Metabolic and Bariatric Surgery and the Obesity Society Joint Annual Scientific Meeting, Atlanta, GA, November 2013.
  • Reconstruction of Major Defects after Oncologic Resection: An Institutional Review. Grimberg G, Walsh K, Scholer A, Lynch L, Keith J, Chokshi R. Oral Presentation at ASC 2017. Las Vegas, NV Feb 7-9, 2017.
  • Robot-Assisted Intra/Extra/Cystic Duct Exploration in a Sickle Cell Disease patient with Biliary Obstruction. Abstract ID: 2848765. Presented at AHPB 2018 Video Presentation (Americas Hepato- Pancreato-Biliary Association). March 7-11 2018. Miami, Florida
  • Perforated Meckel Diverticulitis Masquerading as Acute Appendicitis in a Pregnant Patient. Video Presentation ID: VS2018-74489. Presented at ACS 2018 Video Presentation (American College of Surgeons Clinical Congress). October 21-25 2018. Boston, Massachusetts.


  • Stony Brook University, Stony Brook, NY
  • NJMS Rutgers Newark, NJ
  • John’s Hopkins Bayview Medical Center

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