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Faculty and Staff

Faculty and Staff


Karla Au Yeung, M.D.
Carmen Cuffari, M.D.
Anthony Guerrerio, M.D., Ph.D.
Wikrom W. Karnsakul, M.D.
Christine Karwowski, M.D.
Douglas B. Mogul, M.D., M.P.H.
Maria Oliva-Hemker, M.D. - Division Chief
Ann O. Scheimann, M.D., M.B.A.
Kathleen Schwarz, M.D.
Darla Shores, M.D.

New GI Team

 Hopkins Children's Pediatric GI Faculty

Nurse Practitioners

Pediatric Nurse Practitioners 

Pediatric Nurse Practitioners (PNPs) serve as pediatric health care providers for well and ill children of all ages. PNPs are registered nurses with advanced education and expertise in pediatric nursing and health care and serve children and families in an extensive range of practice settings. PNPs can perform physical exams, diagnose, treat and manage illnesses and diseases, and provide prescription medication regimens. Your child’s appointment may be with a PNP in the Pediatric GI/Nutrition Clinic. In pediatric gastroenterology PNPs work in collaboration with the pediatric gastroenterology physicians to develop a plan of care that is appropriate to treat your child. Any areas of concern are always discussed with the physician

Clinical Nurse Specialist

A clinical nurse specialist (CNS) is an advanced practice nurse whose care focuses on a specific patient population.



  • Meagan Doyle, RN
  • Caroline Goler, RN
  • Susan Holiday, RN
  • Terri Ragan, RN
  • Karen Sheffo, RN
More on our Nursing Team


  • Grace Felix, M.D.   
  • Steven Miller, M.D.
  • Emilia Shin, M.D. 
  • Melissa Weidner, M.D. 
  • Hassan Hamandi, M.D. 
  • Ogholikhan Sina , M.D.

A fellow is a medical doctor who has completed medical school and a three-year pediatric residency program. They are qualified to practice as a general pediatrician, but have applied to and were selected for a three-year training program in a specialized branch of pediatric medicine - pediatric gastroenterology and nutrition.

More on our Fellows and Pediatric GI Fellowships


Kim Conner, R.Ph. MAc,  Senior Clinical Pharmacist

List of Nutritionists and Dietitians

Research Coordinators

  • Vivian Abadom, RN, BSN, MT, MBPH, PhD, Sr. Research Nurse-Coordinator/IBD Program Supervisor
  • Hongxia, Li, MBBS, MS, Sr. Researcher Program Coodinator II
  • Kimverly Kafka, R.N., B.S.N, Research Nurse Manager

Behavioral Psychologist

  • Jessica Hankinson, PhD, Pediatric Psychologist in Pediatric Medical Psychology
    Dr. Hankinson serves as the primary behavioral consultant to the Division of Pediatric Gastroenterology and Nutrition. Dr. Hankinson is part of a multi-disciplinary team that evaluates and treats children with chronic constipation. She also works with children who have inflammatory bowel disease.  


  • L. Philomen Allen, Division Administrative Manager
  • Grace Brzozowski - Fellowship Coordinator
  • Anita Dix - Medical Office Coordinator
  • Kimberly Dorsey - Ambulatory Supervisor
  • Deanna Oliver, BA - Project Analyst
  • Margaret Wilson - Administrative Coordinator