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Photo of Dr. Maria Oliva-Hemker

Maria M Oliva-Hemker, M.D.

Chief, Division of Pediatric Gastroenterology and Nutrition
Professor of Pediatrics

Female  | Languages: English, Spanish

Appointment Phone


Main Location

Johns Hopkins Pediatric Specialty Clinic

Out-of-State & International Patients +
Out of State Patients

Call 410-464-6641 (8a.m. to 6p.m., EST, Mon-Fri)

Learn more about our out-of-state patient services »

International Patients

Call +1-410-502-7683 (7a.m. to 6p.m., EST, Mon-Fri)

Learn more about our international patient services »


  • Chief, Division of Pediatric Gastroenterology and Nutrition
  • Director of Ped. Gastroenterology & Nutrition
  • Stermer Family Professor of Pediatric Inflammatory Bowel Disease
  • Professor of Pediatrics

Centers & Institutes



Johns Hopkins Pediatric Specialty Clinic

Appointment Phone: 410-955-8769

200 N. Wolfe Street
Rubenstein Child Health
Baltimore, MD 21287 map
Phone: 410-955-8765
Fax: 410-955-1464

The Johns Hopkins Hospital

Appointment Phone: 410-955-8769

600 N. Wolfe Street
Sheikh Zayed Tower
Baltimore, MD 21287 map
Phone: 410-955-8769
Fax: 410-955-1464


Gastrointestinal Diseases, Inflammatory Bowel Disease, Pediatric Gastroenterology

Research Interests

Inflammatory bowel diseases; Crohn's disease; ulcerative colitis; Autoimmune enteropathy; Eosinophilic gastroenteritis


Dr. Maria M. Oliva-Hemker is a 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 chief of the Division of Pediatric Gastroenterology and Nutrition at the Johns Hopkins Children’s Center. 

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 chief of the Division of Pediatric Gastroenterology and Nutrition. Since taking on that leadership role, she has more than doubled the number of faculty members and dramatically expanded the academic clinical practice while also enhancing strong research and education programs. The division is now ranked among the top 10 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 80 articles and book chapters and given more than 90 invited talks nationally and internationally. She has served on multiple editorial boards and is currently a member of the Subboard of Pediatric Gastroenterology of the American Board of Pediatrics and the Crohn's and Colitis Foundation of America (CCFA) Board of Trustees. She is an editor-in-chief of the book Your Child with Inflammatory Bowel Disease: A Family Guide for Caregiving.

Her clinical practice focuses on inflammatory intestinal disorders such as IBD, autoimmune enteropathy and eosinophilic gastroenteritis. Additional clinical interests include malabsorption syndromes and nutritionally related disorders such as short bowel syndrome, failure-to-thrive and celiac disease. 

 Dr. Oliva-Hemker has been named among "America's Top Doctors" by Castle Connolly Medical Ltd. for more than 10 years and is included in Marquis' "Who's Who in Medicine and Healthcare." She has been named a Baltimore "Top Doc" by peer physicians and has received a U.S. News & World Report "Top Doctor" designation for being in the top 1% of pediatric gastroenterologists in the nation. more

Featured Video

Constipation in Children is Increasing

    Additional Information

  • Education +


    • Johns Hopkins University School of Medicine / MD (1986)


    • Johns Hopkins University School of Medicine / Pediatrics (1989)


    • Johns Hopkins University School of Medicine / Pediatrics (1993)


    • American Board of Pediatrics / Pediatric Gastroenterology (1992, 2014)
    • American Board of Pediatrics / Pediatrics (1990, 2014)
  • Research & Publications +

    Research Summary

    Dr. Oliva-Hemker is an active clinical researcher who focuses on the treatment of inflammatory bowel diseases in children.

    Selected Publications View all on PubMed

    Sunseri W, Hyams JS, Lerer T, Mack DR, Griffiths AM, Otley AR, Rosh JR, Carvalho R, Grossman AB, Cabrera J, Pfefferkorn MD, Rick J, Leleiko NS, Hitch MC, Oliva-Hemker M, Saeed SA, Kappelman M, Markowitz J, Keljo DJ; Pediatric Inflammatory Bowel Disease Collaborative Research Group. "Retrospective cohort study of methotrexate use in the treatment of pediatric Crohn's disease." Inflamm Bowel Dis. 2014 Aug;20(8):1341-5. doi: 10.1097/MIB.0000000000000102.

    Borschel MW, Antonson DL, Murray ND, Oliva-Hemker M, Mattis LE, Kerzner B, Tolia V, Baggs G. "Two single group, prospective, baseline-controlled feeding studies in infants and children with chronic diarrhea fed a hypoallergenic free amino acid-based formula." BMC Pediatr. 2014 May 29;14:136. doi: 10.1186/1471-2431-14-136.

    Goyal A, Hyams JS, Lerer T, Leleiko NS, Otley AR, Griffiths AM, Rosh JR, Cabrera JM, Oliva-Hemker MM, Mack DR, Rick JN, Pfefferkorn MD, Carvalho R, Grossman AB, Hitch MC, Sudel B, Kappelman MD, Saeed SA, Faubion WA, Schaefer ME, Markowitz JF, Keljo DJ; Pediatric Inflammatory Bowel Disease Collaborative Research Group. "Liver enzyme elevations within 3 months of diagnosis of inflammatory bowel disease and likelihood of liver disease." J Pediatr Gastroenterol Nutr. 2014 Sep;59(3):321-3. doi: 10.1097/MPG.0000000000000409.

    Walters TD, Kim MO, Denson LA, Griffiths AM, Dubinsky M, Markowitz J, Baldassano R, Crandall W, Rosh J, Pfefferkorn M, Otley A, Heyman MB, LeLeiko N, Baker S, Guthery SL, Evans J, Ziring D, Kellermayer R, Stephens M, Mack D, Oliva-Hemker M, Patel AS, Kirschner B, Moulton D, Cohen S, Kim S, Liu C, Essers J, Kugathasan S, Hyams JS; PRO-KIIDS Research Group. "Increased effectiveness of early therapy with anti-tumor necrosis factor-α vs an immunomodulator in children with Crohn's disease." Gastroenterology. 2014 Feb;146(2):383-91. doi: 10.1053/j.gastro.2013.10.027. Epub 2013 Oct 23.

    Hourigan SK, Chirumamilla SR, Ross T, Golub JE, Rabizadeh S, Saeed SA, Elson CO, Kelly CP, Carroll KC, Oliva-Hemker M, Sears C. "Clostridium difficile carriage and serum antitoxin responses in children with inflammatory bowel disease." Inflamm Bowel Dis. 2013 Dec;19(13):2744-52. doi: 10.1097/01.MIB.0000435434.53871.36.

  • Academic Affiliations & Courses +
  • Activities & Honors +


    • "America's Top Doctors," Castle Connolly Medical Ltd.
    • "Top Doctor," U.S News & World Report
    • "Who's Who in Medicine and Healthcare," Marquis
    • "Top Doc," Baltimore Magazine, 2013

    Professional Activities

    • Sub-board of Pediatric Gastroenterology, American Board of Pediatrics
    • Board of Trustees, Crohn's and Colitis Foundation of America (CCFA)
    • Editorial board, Journal of Pediatric Gastroenterology and Nutrition
    • Editorial board, Inflammatory Bowel Diseases
  • Videos & Media +

    Recent News Articles & Media Coverage

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