Gerard E Mullin, M.D., M.S.

Headshot of Gerard E Mullin
  • Director, JHH GI Clinical Laboratory
  • Associate Professor of Medicine


Anemias, Blood in Stool (Hematochezia), Celiac Disease, Colon Cancer, Colon Polyps, Colonoscopy, Constipation, Diarrhea, Gastroenterology, Gastroesophageal Reflux Disease (GERD), Gastrointestinal Bleeding, Heartburn, Hiatal Hernia, Iron Deficiency, Irritable Bowel Syndrome, Malabsorption, Rectal Bleeding, Stomach Ulcer, Unexplained Weight Loss more

Research Interests

Nutrition; Gut Microbiome

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The Johns Hopkins Hospital

Appointment Phone: 410-933-7495
600 N. Wolfe Street
Baltimore, MD 21287
Fax: 410-502-0603
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Dr. Mullin is an associate professor of medicine at The Johns Hopkins University School of Medicine. Nationally and internationally renowned for his work in nutrition, Dr. Mullin has more than 30 years of clinical experience in the field of gastroenterology. In 2009 he was named by the American Dietetic Association’s honorary member of the year. Dr. Mullin was the youngest person to receive an Honorary membership from the American Dietetic Association in 2009. He also received the Grace A. Goldsmith award presented by the American College of Nutrition in November 2011. This special award acknowledges a scientist who is under the age of 50 years, for significant achievements in the field of nutrition.  Dr. Mullin is a reviewer and also serves on the editorial board of numerous gastroenterology journals. more


  • Director, JHH GI Clinical Laboratory
  • Co-Chair, JHH Nutrition Advisory Committee
  • Associate Professor of Medicine

Departments / Divisions



  • MD; UMDNJ-New Jersey Medical School (1985)


  • Medicine; The Mount Sinai Hospital (1988)


  • Gastroenterology; Johns Hopkins University School of Medicine (1991)
  • Integrative Medicine; University of Arizona Health Sciences Center (2008)

Board Certifications

  • American Board of Internal Medicine (Gastroenterology) (1991)
  • American Board of Internal Medicine (Internal Medicine) (1988)

Additional Training

Fellowship, National Institutes of Health - Credentialing Services Section / Integrative Medicine (Bethesda MD ) (1991)

Research & Publications

Activities & Honors


  • Alpha Omega Alpha (AOA), 1985


  • Alpha Omega Alpha, 1985
  • American College of Gastroenterology, 1992
  • American College of Nutrition, 2006
  • American Gastroenterology Association, 1992

Videos & Media

Recent News Articles and Media Coverage

DDW News video: Dietary supplements and the practice of gastroenterology

Rethinking Elimination Diets and FODMAPS: A Common-Sense Approach to IBS, Inside Tract (Fall 2018)

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