Dr. Samuel N. Marcus, M.D., Ph. D.; F.R.C.P. ( London); AGA(F)

Expert Publications

• The pre-ulcerative phase of carrageenan-induced colonic ulceration in the guinea-pig.
• Endoscopic removal of two leaking alkaline batteries.
• Efficiency in endoscopy centers.
• Early experience with radiofrequency energy ablation therapy for Barrett's esophagus with and without dysplasia.
• Algorithmic approach to patients presenting with heartburn and epigastric pain refractory to empiric proton pump inhibitor therapy.
• Multimodality evaluation of patients with gastroesophageal reflux disease symptoms who have failed empiric proton pump inhibitor therapy.
• Effective intra-esophageal acid control is associated with improved radiofrequency ablation outcomes in Barrett's esophagus.
• Transport, metabolism, and effect of chronic feeding of lagodeoxycholic acid. A new, natural bile acid.
• Particle size of wheat, maize, and oat test meals: effects on plasma glucose and insulin responses and on the rate of starch digestion in vitro.
• Rapid production of ulcerative disease of the colon in newly-weaned guinea-pigs
• The effect of testa triticum tricum on intestinal transit, deoxycholic acid metabolism and the cholesterol saturation of bile.
• Effects of a new, concentrated wheat fibre preparation on intestinal transit, deoxycholic acid metabolism and the composition of bile.
• Irritable bowel-type symptoms in spontaneous and induced constipation.
• Evidence for loss of tritium from 3 beta-tritiated deoxycholic acid during enterohepatic cycling in man.
• Deoxycholic acid and the pathogenesis of gall stones.

Media Releases

Get to know Gastroenterologist Dr. Samuel N. Marcus, who serves patients in Mountain View, California.

Dr. Marcus is a practicing gastroenterologist serving the San Francisco Bay Area from his clinic in Mountain View, California since 1992. He is particularly interested in the early detection and prevention of colon cancer, the diagnosis and management of Crohn’s disease and ulcerative colitis, and the endoscopic management of obesity.

Some of the procedures that he performs include: colonoscopy, endoscopy, sigmoidoscopy, and hemorrhoid removal.

Among his other clinical and academic appointments, Dr. Marcus has been serving as an Adjunct Clinical Professor of Medicine at the Stanford University School of Medicine since 2002. He is also an attending physician at El Camino Hospital, Mountain View Endoscopy Center, and Stanford University Medical Center, as well as serves as the Medical Director of El Camino Crohn’s and Colitis Medical Clinic.

His acclaimed career in medicine began after he earned his medical degree from the University of Liverpool School of Medicine in 1977. He then went on to serve his residency in internal medicine and his fellowship in gastroenterology at the same educational venue in 1981 and 1983, respectively. 

From 1983 until 1985, he served as an instructor in gastroenterology and PhD candidate at Bristol University. He followed this up with an advanced fellowship in gastroenterology at the Liverpool University School of Medicine in 1987, and a U.K. Medical Research Council Traveling fellowship and a fellowship in gastroenterology at UCSD in 1988. 

Specializing in diseases and disorders of the digestive tract and liver, Dr. Marcus is board-certified in gastroenterology by the American Board of Internal Medicine (ABIM). The ABIM is a physician-led, non-profit, independent evaluation organization driven by doctors who want to achieve higher standards for better care in a rapidly changing world. 

A Diplomate of the Joint Commission in Higher Medical Training in Gastroenterology (UK), he is a Fellow of the Royal College of Physicians (London), a Fellow of the American Gastroenterological Association, and Chairman of the Endoscopy Medical Surgical Organization.

Additionally, he is a member of the American College of Gastroenterology, the American Society of Gastrointestinal Endoscopy, the British Society of Gastroenterology, and the Crohn’s and Colitis Foundation of America.

Gastroenterology is the branch of medicine focused on the digestive system and its disorders. A gastroenterologist is a physician who has extensive training in the diagnosis and treatment of disorders related to the esophagus, stomach, small intestines, colon, liver, pancreas, and biliary system.

Throughout his extensive career, Dr. Marcus has authored articles published in the British Medical Journal, Gastroenterology, Gut, Journal of Clinical Investigation, British Journal of Nutrition, Gastrointestinal Endoscopy, and Lipids.

Among his various awards and honors include: Top Doctor in Gastroenterology in San Francisco Bay Area: 2000-2014,Castle Connolly’s America’s Top Doctors; Top Doctor in Gastroenterology: 2013, US News and World Report; Healthgrades Recognized Doctor; and Top Doctor in Gastroenterology: 2000-2003 San Jose Magazine.

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