Eric Jelin, MD

Johns Hopkins pediatric surgeons at Greater Baltimore Medical Center in Baltimore, Maryland understand the special needs of children and are world-renowned for their unique surgical expertise and skills and their research, which is targeted at developing new techniques and medicines that make surgery both safe and effective. Located in Physicians Pavilion East, Suite 313, the division is committed to delivering comprehensive and compassionate family-centered care, conducting innovative medical research, and providing the best training to our surgeons and physicians.

The Brady Urological Institute is home to many of the world’s most accomplished urologic medicine experts. We work closely with oncology, pediatrics, nephrology and other specialists from across Johns Hopkins to provide personalized treatment plans and exceptional, research-driven care.

Dr. Maria M. Oliva-Hemker is the Stermer Family Professor of Pediatric Inflammatory Bowel Disease and Professor of Pediatrics at the Johns Hopkins University School of Medicine. Her areas of clinical expertise include gastrointestinal diseases, inflammatory bowel disease (IBD) and pediatric gastroenterology. She serves as the director of the Division of Pediatric Gastroenterology, Hepatology and Nutrition at the Johns Hopkins Children’s Center. In 2021 Dr. Oliva-Hemker was named Vice Dean for Faculty.Dr. Oliva-Hemker received her M.D. from Johns Hopkins. She completed her residency in pediatrics followed by a fellowship in pediatric gastroenterology at Johns Hopkins. She joined the Johns Hopkins faculty in 1993.In 2008, Dr. Oliva-Hemker was appointed director of the Division of Pediatric Gastroenterology, Hepatology and Nutrition. Since taking on that leadership role, she has tripled the number of faculty members and dramatically expanded the academic clinical practice while also enhancing strong research and education programs. The division is highly ranked among the top programs in the country by U.S. News & World Report.In 1998, she launched the Pediatric Inflammatory Bowel Disease (IBD) Center at Johns Hopkins, which specializes in the evaluation, diagnosis, and treatment of hundreds of children and teens with Crohn's disease and ulcerative colitis from all over the world. She is the inaugural recipient of the Stermer Family Professorship in Pediatric Inflammatory Bowel Disease. Dr. Oliva-Hemker is an active clinical researcher who has co-authored more than 100 articles and book chapters and has given more than 100 invited talks nationally and internationally. She has served in leadership positions in multiple organizations including the North American Society for Pediatric Gastroenterology, Hepatology and Nutrition, the American Academy of Pediatrics, the Subboard of Pediatric Gastroenterology of the American Board of Pediatrics, the Crohn's and Colitis Foundation Board of Trustees and the Journal of Pediatric Gastroenterology and Nutrition. She is editor-in-chief of the book Your Child with Inflammatory Bowel Disease: A Family Guide for Caregiving (JHU Press).Her clinical practice focuses on inflammatory intestinal disorders such as IBD, autoimmune enteropathy, celiac disease and eosinophilic gastroenteritis. She established fecal microbiota transplantation at Hopkins for children with recurrent C. difficile infection. Dr. Oliva-Hemker is highly respected among her peers and provides second opinions for patients referred to her from throughout the United States. She actively teaches medical students, residents, and fellows. In addition to her outpatient clinics she performs a variety of endoscopic procedures and attends on the inpatient and consultation pediatric gastroenterology services. Dr. Oliva-Hemker has been named among "America's Top Doctors" by Castle Connolly Medical Ltd. for more than 20 years and is included in Marquis' "Who's Who in Medicine and Healthcare." She has been repeatedly named a Baltimore "Top Doc" by peer physicians and was on the cover of Baltimore Magazine's 2013 Top Doc issue. She has received a U.S. News & World Report "Top Doctor" designation for being in the top 1% of pediatric gastroenterologists in the nation. Dr. Oliva-Hemker was the recipient of the Excellence in Healthcare Award from the Maryland/Southern Delaware Chapter of the Crohn's & Colitis Foundation.