Jeffrey I. Brown, M.D

Dr. Jeffrey Brown is board certified in Internal Medicine and Gastroenterology by the American Board of Internal Medicine. He earned his B.S. degree with honors from the University of Miami (Fla.) in 1976 and received a M.S. Degree in Medical Physiology from Ohio State University in 1978. He attended the Medical College of Ohio (Toledo) where he received his Medical Degree in 1981. He was inducted into the Alpha Omega Alpha Medical Honor Society at that time. He completed his internship and residency at Akron General Medical Center, where he served an additional year as Chief Resident. He completed his gastroenterology fellowship at the University of South Florida in 1987.

Dr. Brown is a member of the American College of Gastroenterology, Tennessee Medical Association, and Knoxville Academy of Medicine.

Mark W. Jackson, MD, FACG

Dr. Jackson graduated from Westminster College in Fulton, Missouri. He received his medical degree from the University of Missouri in 1985 and then went on to complete an internal medicine residency and a fellowship in gastroenterology at the Medical College of Georgia.

Before entering Knoxville private practice in 1996, Dr. Jackson served on the medical school faculty at the Medical College of Georgia where he received special training in therapeutic biliary procedures (ERCP) and ran an academic gastroenterology service. He is currently ABIM Board Certified in Gastroenterology (1991, recertified 2001) and Internal Medicine (1989). Dr Jackson is a Fellow in the American College of Gastroenterology (FACG), a member of American Society of Gastrointestinal Endoscopy (ASGE), and was inducted into the Alpha Omega Alpha (AOA) honorary medical society.

Specializing in the diagnosis and management of digestive disorders, Dr. Jackson has broad expertise in endoscopic procedures including colonoscopy, upper endoscopy (EGD), ERCP, BRAVO (TM) pH monitoring, and now capsule endoscopy. He enjoys spending time with his family and friends and has outside interests in golf, music, snowboarding, and fitness activity.

Muhammed Iqbal, M.D

Dr. Iqbal is board certified both in Gastroenterology and Internal Medicine by the American Board of Internal Medicine. He has been in private practice in Knoxville since 1998. After graduating from Chittagong Medical College, he completed his residency in Internal Medicine at St. Luke’s Medical Center, Case Western Reserve University, Cleveland, Ohio. Dr. Iqbal pursued a fellowship in Gastroenterology at the East Tennessee State University. He also did a year of research fellowship at the University of Pittsburgh School of Medicine.

Dr. Iqbal is a member of the American Gastroenterological Association, the American College of Gastroenterology and the American Society for Gastrointestinal Endoscopy.

His interests include the diagnosis and management of acute and chronic gastrointestinal illnesses, colon cancer prevention and endoscopic procedures. Dr. Iqbal and his wife, Farzana, are proud parents of twins. He enjoys music and photography.

Robert A. Pollack, M.D

Dr. Robert Pollack completed his undergraduate studies at the University of Florida. He graduated with high honors, earning a bachelor’s degree in Microbiology. He was inducted into the Phi Beta Kappa Honor Society. Dr. Pollack received his medical degree from University of South Florida in 1988.

Following medical school, he completed his Internal Medicine internship and residency at the Medical College of Pennsylvania, where he served an additional year as chief resident and Instructor of Medicine. During his tenure he was inducted into the Alpha Omega Alpha Honor Society. Dr. Pollack’s Gastroenterology fellowship was fulfilled at the University of Miami. Prior to relocating to Tennessee, he was in private practice in St. Petersburg, Florida for over five years. Dr. Pollack is board certified in Gastroenterology and Internal Medicine. He has expertise in the treatment of a broad range of gastrointestinal and liver disorders. He performs a wide variety of endoscopic procedures including upper endoscopy, colonoscopy, and ERCP.

Dr. Pollack is an avid outdoorsman and relishes living near the Smoky Mountains. He enjoys biking, golf, hiking, camping and spending time with his wife and three sons.

Robbie Leinart, MSN-APRN-BC

Robbie is a board certified Nurse Practitioner. She received her Diploma RN from the Fort Sanders School of Nursing and completed her BSN at the University of Tennessee Knoxville. She later earned her master’s degree in nursing with a concentration in Adult Nurse Practitioner. She started working in Gastroenterology as an endoscopy nurse in 2001 before moving into an office setting as a Nurse Practitioner in 2006.

Her interests include competing in various races both locally and nationwide, travelling, and spending time with her husband and two toy poodles.

Richard A. Cohn, MD, Ph.D (Retired)

Dr. Cohn attended the University of Texas Medical Branch in Galveston where he received a Ph.D. in Pharmacology as well as his Doctor of Medicine Degree. He then completed his Internal Medicine training as well as a Chief Residency in Medicine at the University of Connecticut Medical School in Farmington. He remained at the University of Connecticut for his subspecialty training in gastroenterology. Dr. Cohn is Board Certified in internal Medicine and Gastroenterology. He is a member of the American Gastroenterological Association, the American Medical Association and the Tennessee Medical Association. He is proficient in diagnostic and therapeutic endoscopy, including upper endoscopy, colonoscopy and endoscopic examination of the bile duct system and pancreatic duct system (ERCP). Dr. Cohn is interested in a variety of gastrointestinal disorders, including colon cancer screening, inflammatory bowel disease, and pancreatic and biliary disease.

His outside interests include spending time with his family and friends, golf, hiking, and making slow smoked barbeque.