Dr. McNerney

Board Certified Gastroenterologist

Jack McNerney, MD, FACP, FACG was born in Washington, D.C. He graduated magna cum laude from Georgetown University with a major in biology and a minor in philosophy in 1980. He received his medical degree from Northwestern University School of Medicine in 1984 and completed his GI fellowship at Brooke Army Medical Center in Fort Sam Houston, Texas. He served in the US Army Medical Corps from 1985 to 1996 and joined the medical staff of Tucson Gastroenterology in 1996.

Dr. McNerney is board certified in internal medicine and gastroenterology. He is a fellow of the American College of Physicians and a fellow of the American College of Gastroenterology. He is a member of the American Society for Gastrointestinal Endoscopy. He lives in Tucson with his wife and 3 children. He enjoys traveling and outdoor activities with his family.

Dr. McCallum

Board Certified Gastroenterologist

Robert McCallum, MD was born to British parents in Venezuela while his Dad worked for Shell Oil but returned to the UK before he was one year old. When he was 4 his Dad was transferred this time to Argentina where his family remains to this day. He grew up fully bilingual speaking English at home and Spanish outside the home. He completed his Medical studies at the Universidad de Buenos Aires in 1987 having done undergraduate studies both in Argentina and in Canada at the University of British Columbia. He came to the US in 1988 and took all the pertinent exams to become qualified as a US Doctor while working as a researcher at Georgetown University in Washington DC. He spent three years there obtaining his green card and in 1991 began his five year long specialization. He graduated from residency from Abington Memorial Hospital in Pennsylvania in 1994 as an Internist and two years later he completed his Gastroenterology Fellowship at Temple University Hospital in Philadelphia.

In his professional life he has worked both in Virginia (Eastern Shore), for the first 7 years, and in Arizona, for the last 12 years where he started his own practice in Oro Valley. He ran the department of gastroenterology at Oro Valley Hospital for the last ten years having been voted section head by his peers five times in a row. Due to industry changes and pressures of owning a practice he joined forces with Dr. McNerney in July of 2014. He is Board Certified in Gastroenterology.

Dr. McCallum is married and has three children at various stages of life. He enjoys being a Dad and a husband. His hobbies include hiking and nature photography as well as travel and good food!

Dr. Hanna

Board Certified Gastroenterologist

Dr. Hanna was born in Damascus. He received his Medical Degree from the University of Damascus, School of Medicine in 1995. He completed his residency at the University of Connecticut in 2004 and his Gastroenterology fellowship at the University of Arizona, College of Medicine in 2011. Dr. Hanna has been in practice in the Tucson community since 2011.

Dr. Hanna is Board Certified in Internal Medicine and Gastroenterology. He is a fellow of the American College of Physicians and a fellow of the American College of Gastroenterology. Dr. Hanna is married and has 2 children. He enjoys spending time with his family, socializing with friends, travel and good food.

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