Attending Physician
Assistant Professor of Clinical Surgery, Keck School of Medicine of USC
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Clinical Interests

Neonatal Surgery Necrotizing Enterocolitis Intestinal Dysmotility Inflammatory Bowel Disease


Medical School: 

Wayne State University School of Medicine


Wayne State University


Wayne State University


Children's Hospital of Michigan



American Board of Surgery; General and Pediatric Surgery

Professional Memberships: 

American College of Surgeons American Academy of Pediatrics American Pediatric Surgery Association Association for Academic Surgery


Limiting chest computed tomography in the evaluation of pediatric thoracic trauma. Golden J, Isani M, Bowling J, Zagory J, Goodhue CJ, Burke RV, Upperman JS, Gayer CP. Journal of Trauma and Acute Care Surgery. 2016 May 18. [Epub ahead of print]

An ectopic renin-secreting adrenal corticoadenoma in a child with malignant hypertension. Kaslow AM, Riquier-Brison A, Peti-Peterdi J, Shillingford N, HaDuong J, Venkatramani R, Gayer CP. Physiological Reports. 2016 Mar;4(5). pii: e12728. doi: 10.14814/phy2.12728.

Liquid chromatography-mass spectroscopy as a tool in the rapid diagnosis of biliary atresia: a pilot study. Nguyen M, Dossa A, Zagory J, Golden J, Roberts A, Fu X, Wang K, Gayer CP. Journal of Pediatric Surgery. 2016 Mar 3. pii: S0022-3468(16)00141-X. doi: 10.1016/j.jpedsurg.2016.02.053. [Epub ahead of print]

Bile acids regulate intestinal cell proliferation by modulating EGFR and FXR signaling. Dossa AY, Escobar O, Golden J, Frey MR, Ford HR, Gayer CP. American Journal of Physiology, Gastrointestinal and Liver Physiology. 2016 Jan 15;310(2):G81-92. doi: 10.1152/ajpgi.00065.2015. Epub 2015 Nov 25.

Admission hematocrit predicts the need for transfusion secondary to hemorrhage in pediatric blunt trauma patients. Golden J, Dossa A, Goodhue CJ, Upperman JS, Gayer CP. Journal of Trauma and Acute Care Surgery. 2015 Oct;79(4):555-62. doi: 10.1097/TA.0000000000000806.

Research Interests: 
  • Intestinal physiology and pathophysiology
  • Necrotizing enterocolitis
  • Inflammatory bowel disease

Dr. Gayer is a pediatric surgeon.  His research focuses on necrotizing enterocolitis (NEC), a disease that causes intestinal necrosis in premature infants.  He studies the microbiome, which is the bacterial population of the intestine, to identify specific bile acid metabolites that cause changes in the bacterial profile of infants. Greater understanding of these mechanisms may lead to new therapeutic options for babies with NEC.

4650 Sunset Blvd.
Pediatric Surgery, MS 100
Los Angeles, CA 90027
Phone: 323-361-4974Office