The Division of Gastroenterology, Hepatology and Nutrition at Children’s Hospital of Philadelphia (CHOP) is pleased to introduce five new attending physicians. All are available to examine pediatric patients and consult with referring physicians and families to determine the best therapy, treatment and long-term follow-up care.
Aaron D. Bennett, MD
Aaron D. Bennett, MD, was hired as an attending physician with CHOP’s Division of Gastroenterology, Hepatology and Nutrition and Liver Transplant Program in 2025. He earned his medical degree from Temple University School of Medicine in Philadelphia, completed his residency at Yale New Haven Children’s Hospital, New Haven, CT, where he was chief resident. Before being hired as an attending physician at CHOP, Dr. Bennett completed a pediatric gastroenterology fellowship at CHOP. He is also an assistant professor of clinical pediatrics at the Perelman School of Medicine at the University of Pennsylvania. Dr. Bennett evaluates and treats hepatology and liver transplant patients at CHOP.
Alexander Y. Coe, MD, MEd
Alexander Y. Coe, MD, MEd, is an attending physician with the Division of Gastroenterology, Hepatology and Nutrition at CHOP. He earned his graduate degree in curriculum and instruction from the University of Nevada, and his medical degree from the University of Nevada’s School of Medicine. Dr. Coe completed his residency and internship at Cincinnati Children’s Hospital Medical Center in Ohio, before moving to Philadelphia for his two fellowships. He served as an advanced fellow in advanced endoscopy at the University of Pennsylvania School of Medicine, and a pediatric gastroenterology fellowship at CHOP. Dr. Coe’s areas of expertise include advanced and therapeutic endoscopy, endoscopic ultrasound, and pancreatic and biliary disorders. He works with the Esophageal and Airway Treatment Program, Pancreatic Disorders Program, Kohl’s GI Nutrition and Diagnostic Center, as well as with the GI division. Dr. Coe treats patients at CHOP’s Main Building.
Elaine Lin, MD
Elaine Lin, MD, was hired as a physician and researcher with the Division of Gastroenterology, Hepatology and Nutrition at CHOP in 2025. Dr. Lin earned her medical degree from Florida Atlantic University, Boca Raton, FL, and completed her residency at Cohen Children’s Medical Center, New Hyde Park, NY. She completed a fellowship in pediatric gastroenterology, hepatology and nutrition at Hassenfeld Children’s Hospital at NYU Langone in New York City. Along with serving as a physician and researcher at CHOP, Dr. Lin is also an assistant professor of clinical pediatrics at the Perelman School of Medicine at the University of Pennsylvania. Her area of expertise includes nutrition services and general GI support to patients at CHOP.
Mark Mahon, MBBCh, BAO
Mark Mahon, MBBCh, BAO, is a physician and researcher with the Division of Gastroenterology, Hepatology and Nutrition at CHOP. Dr. Mahon earned his medical degree from Trinity College Dublin in Ireland before joining Jacobi Medical Center, Bronx, NY, as a pediatric resident. He also served 2 years as a HASP fellow with NYC Health & Hospitals. Dr. Mahon joined CHOP as a pediatric gastroenterology fellow in July 2022, where he served until he was hired as a physician in 2025. Dr. Mahon also serves as an assistant professor of clinical pediatrics at the Perelman School of Medicine at the University of Pennsylvania. His clinical areas of expertise include eosinophilic GI diseases and transnasal endoscopy.
Haley Pearlstein, MD
Haley Pearlstein, MD, is a physician and researcher with the Division of Gastroenterology, Hepatology and Nutrition at CHOP. She earned a master’s degree in public health from Thomas Jefferson University and her medical degree from the Philadelphia College of Osteopathic Medicine, both in Pennsylvania. Along with serving as a physician and researcher at CHOP, Dr. Pearlstein also works as an assistant professor of clinical pediatrics at the Perelman School of Medicine at the University of Pennsylvania. Dr. Pearlstein’s area of focus includes motility and general GI.
View Dr. Pearlstein’s biography
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The Division of Gastroenterology, Hepatology and Nutrition at Children’s Hospital of Philadelphia (CHOP) is pleased to introduce five new attending physicians. All are available to examine pediatric patients and consult with referring physicians and families to determine the best therapy, treatment and long-term follow-up care.
Aaron D. Bennett, MD
Aaron D. Bennett, MD, was hired as an attending physician with CHOP’s Division of Gastroenterology, Hepatology and Nutrition and Liver Transplant Program in 2025. He earned his medical degree from Temple University School of Medicine in Philadelphia, completed his residency at Yale New Haven Children’s Hospital, New Haven, CT, where he was chief resident. Before being hired as an attending physician at CHOP, Dr. Bennett completed a pediatric gastroenterology fellowship at CHOP. He is also an assistant professor of clinical pediatrics at the Perelman School of Medicine at the University of Pennsylvania. Dr. Bennett evaluates and treats hepatology and liver transplant patients at CHOP.
Alexander Y. Coe, MD, MEd
Alexander Y. Coe, MD, MEd, is an attending physician with the Division of Gastroenterology, Hepatology and Nutrition at CHOP. He earned his graduate degree in curriculum and instruction from the University of Nevada, and his medical degree from the University of Nevada’s School of Medicine. Dr. Coe completed his residency and internship at Cincinnati Children’s Hospital Medical Center in Ohio, before moving to Philadelphia for his two fellowships. He served as an advanced fellow in advanced endoscopy at the University of Pennsylvania School of Medicine, and a pediatric gastroenterology fellowship at CHOP. Dr. Coe’s areas of expertise include advanced and therapeutic endoscopy, endoscopic ultrasound, and pancreatic and biliary disorders. He works with the Esophageal and Airway Treatment Program, Pancreatic Disorders Program, Kohl’s GI Nutrition and Diagnostic Center, as well as with the GI division. Dr. Coe treats patients at CHOP’s Main Building.
Elaine Lin, MD
Elaine Lin, MD, was hired as a physician and researcher with the Division of Gastroenterology, Hepatology and Nutrition at CHOP in 2025. Dr. Lin earned her medical degree from Florida Atlantic University, Boca Raton, FL, and completed her residency at Cohen Children’s Medical Center, New Hyde Park, NY. She completed a fellowship in pediatric gastroenterology, hepatology and nutrition at Hassenfeld Children’s Hospital at NYU Langone in New York City. Along with serving as a physician and researcher at CHOP, Dr. Lin is also an assistant professor of clinical pediatrics at the Perelman School of Medicine at the University of Pennsylvania. Her area of expertise includes nutrition services and general GI support to patients at CHOP.
Mark Mahon, MBBCh, BAO
Mark Mahon, MBBCh, BAO, is a physician and researcher with the Division of Gastroenterology, Hepatology and Nutrition at CHOP. Dr. Mahon earned his medical degree from Trinity College Dublin in Ireland before joining Jacobi Medical Center, Bronx, NY, as a pediatric resident. He also served 2 years as a HASP fellow with NYC Health & Hospitals. Dr. Mahon joined CHOP as a pediatric gastroenterology fellow in July 2022, where he served until he was hired as a physician in 2025. Dr. Mahon also serves as an assistant professor of clinical pediatrics at the Perelman School of Medicine at the University of Pennsylvania. His clinical areas of expertise include eosinophilic GI diseases and transnasal endoscopy.
Haley Pearlstein, MD
Haley Pearlstein, MD, is a physician and researcher with the Division of Gastroenterology, Hepatology and Nutrition at CHOP. She earned a master’s degree in public health from Thomas Jefferson University and her medical degree from the Philadelphia College of Osteopathic Medicine, both in Pennsylvania. Along with serving as a physician and researcher at CHOP, Dr. Pearlstein also works as an assistant professor of clinical pediatrics at the Perelman School of Medicine at the University of Pennsylvania. Dr. Pearlstein’s area of focus includes motility and general GI.
View Dr. Pearlstein’s biography
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