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Jonathan Jun, M.D.

Photo of Dr. Jonathan Jun, M.D.
  • Associate Professor of Medicine

Languages: English, Mandarin


Pulmonary and Critical Care Medicine, Respiratory Failure, Sleep Medicine

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Johns Hopkins Outpatient Center

Appointment Phone: 443-287-3313
601 N. Caroline St.
Suite 1261 Baltimore, MD 21287 map
Phone: 443-287-3313 | Fax: 443-287-3312

Johns Hopkins Bayview Medical Center

Appointment Phone: 443-287-3313
5501 Hopkins Bayview Circle
Asthma and Allergy Center Suite 5B.81 Baltimore, MD 21224 map
Phone: 410-550-0115 | Fax: 410-550-2612


Dr. Jun is a pulmonary, critical care, and sleep medicine physician. He is an expert in the diagnosis and treatment of sleep-disordered breathing, and in the care of critically ill patients in the Medical ICU. He is a member of the Sleep Fellowship Program Evaluation and Clinical Competency Committee and provides teaching to medical students and residents at Johns Hopkins. more


  • Associate Professor of Medicine

Departments / Divisions

Centers & Institutes



  • MD, University of Maryland School of Medicine (2003)


  • Thomas Jefferson University Hospital (2006)


  • Johns Hopkins University School of Medicine / Pulmonary and Critical Care Medicine (2011)

Board Certifications

  • American Board of Internal Medicine / Critical Care Medicine (2015)
  • American Board of Internal Medicine / Pulmonary Disease (2013)
  • American Board of Internal Medicine / Sleep Medicine (2011)

Research & Publications

Research Summary

Dr. Jun's long-term goal is to understand the bi-directional relationship between respiratory and metabolic health.  Studies include metabolic / cardiovascular impacts of obstructive sleep apnea, effects circadian rhythm and sleep on substrate metabolism, and interventions for obesity hypoventilation syndrome.   

Lab Website: Polotsky Research Lab

Contact for Research Inquiries

Johns Hopkins Bayview
5501 Hopkins Bayview Circle Room 5A.50.
Baltimore, MD 21224 map

Activities & Honors


  • First Place, Scientific Seminar Series, Johns Hopkins Postdoctoral Association, 2009
  • James B. Skatrud New Investigator Award, American Thoracic Society, 2013
  • Emerging Leaders Program, American Thoracic Society, 2016
  • Finalist, W. Leigh Thompson Excellence in Research: Clinical Research Faculty Award, Johns Hopkins, 2017


  • American Academy of Sleep Medicine
  • American Thoracic Society
  • Association of Critical Care Medicine

Videos & Media

Recent News Articles and Media Coverage

This is the weird reason you can’t lose weight, according to science, Ladders (June 16, 2020)

Metabolic Effects of Late Dinner in Healthy Volunteers—A Randomized Crossover Clinical Trial, Oxford University Press (June 2020)

Patient Ratings & Comments

The Patient Rating score is an average of all responses to physician related questions on the national CG-CAHPS Medical Practice patient experience survey through Press Ganey. Responses are measured on a scale of 1 to 5, with 5 being the best score. Comments are also gathered from our CG-CAHPS Medical Practice Survey through Press Ganey and displayed in their entirety. Patients are de-identified for confidentiality and patient privacy.

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