Steven Brennan, MBBS

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Assistant Professor of Pediatrics, Allergy and Pulmonary Medicine
Allergy and Pulmonary Medicine

phone: (314) 454-2694

Clinical Interests

Dr. Brennan received his Bachelor of Social Work degree from the University of Victoria in Victoria, Canada. After working as a Social Worker in the health care field for three years he moved to Australia where he earned his medical degree from the University of Queensland. He then moved to the United States and completed his Residency in Pediatrics at St. Louis University followed by his fellowship in Pediatric Pulmonology at Washington University in St. Louis. Throughout his fellowship he studied screening techniques for primary ciliary dyskinesia (PCD) in conjunction with the Washington University Pediatric Otolaryngology Clinic. He continues to work in the laboratory of Dr. Steven Brody studying phenotypes of novel PCD mutations. Dr. Brennan's research and clinical interests are in the areas of (PCD) and rare pulmonary disorders. He also takes an active role in helping educate Washington University medical students.


  • BSW, Honors, University of Victoria2007
  • MBBS, University of Queensland2013


  • Resident in Pediatrics, St. Louis University / Cardinal Glennon Children's Hospital2014 - 2017
  • Fellow in Pediatric Pulmonology, Washington University / St. Louis Chidren's Hospital2017 - 2020
  • Rare Diseases Clinical Research Network Certificate Program, National Institutes of Health2018 - 2019

Licensure and Board Certification

  • 2017 - 2022American Board of Pediatrics, General Pediatrics
  • 2019 - 2022MO, Registered Physician
  • 2020 - PresAmerican Board of Pediatrics, Pediatric Pulmonology

Honors and Awards

  • Cystic Fibrosis Foundation: Resident Roundtable Travel Grant2016
  • Pediatrics Clinical Teaching Award2020
  • Washington University Office of Education: Academy of Educators - Honor Roll2021

Recent Publications view all (5)

Publication Co-Authors

  1. Markers for severe disease and long-term sequelae in pediatric patients with severe acute respiratory syndrome coronavirus 2 infection Pediatr Int. 2022;64(1). doi:10.1111/ped.15177.   PMID:35522823 
  2. Emerging genotype-phenotype relationships in primary ciliary dyskinesia Int J Mol Sci. 2021;22(15). doi:10.3390/ijms22158272   PMID:34361034 
  3. Implementation of a screening tool for primary ciliary dyskinesia (PCD) in a pediatric otolaryngology clinic Int J Pediatr Otorhinolaryngol. 2020;31(142). doi:10.1016/j.ijporl.2020.110586  PMID:33388601 
  4. Serum sickness-like reaction following initiation of elexacaftor/tezacaftor/ivacaftor therapy Pediatr Pulmonol. 2020. doi:10.1002/ppul.25072   PMID: 32956574 
  5. Effects of a PICU Status Asthmaticus De-Escalation Pathway on Length of Stay and Albuterol Use. Pediatr Crit Care Med. 2018;19(7):658-664. doi:10.1097/PCC.0000000000001551.  PMID:29664873 
Last updated: 10/21/2022
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