Dr. Parker is an intensivist, clinical medical ethicist, and health services researcher who runs an NIH-funded data science lab focused on the algorithmic allocation of scarce healthcare resources. He is specifically interested in absolute scarcity problems, where demand greatly exceeds supply, and healthcare systems cannot avoid rationing. He applies advanced empirical methods to evaluate and design allocation systems according to the underlying ethical principles. His current projects focus on deceased donor organ allocation policy, life-support triage under crisis standards of care, and the allocation of novel scarce therapeutics. Dr. Parker is the founding executive director of the Common Longitudinal ICU data Format (CLIF) consortium, a growing network of ICU data science labs that develop and utilize the open-source CLIF data standard to perform privacy-preserving federated ICU data science.
University of Chicago
PhD
2021
University of Chicago
Pulmonary and Critical Care Fellowship
2019
University of Chicago
MS
2018
University of Chicago
Internal Medicine Residency
2015
University of Chicago
Medical Ethics Fellowship
2015
Pritzker School of Medicine, University of Chicago
MD
2012
Williams College
BA
2008
Why the SRTR metric "Survival on the Waitlist" is still useful in the age of short liver transplant waiting times.
Why the SRTR metric "Survival on the Waitlist" is still useful in the age of short liver transplant waiting times. Liver Transpl. 2026 Sep 16.
PMID: 42758879
Rank order of candidates for heart transplantation in France: An explainable machine learning analysis.
Rank order of candidates for heart transplantation in France: An explainable machine learning analysis. Am J Transplant. 2026 Sep 11.
PMID: 42727857
Under-Capture of Candidates Supported by Temporary Mechanical Circulatory Support in the OPTN STAR Registry.
Under-Capture of Candidates Supported by Temporary Mechanical Circulatory Support in the OPTN STAR Registry. JACC Adv. 2026 Sep 10; 5(10 Pt 2):103213.
PMID: 42721605
Beyond Categorical Tiers: Improving Measurement of Medical Urgency as the Foundation for Heart Allocation Reform.
Beyond Categorical Tiers: Improving Measurement of Medical Urgency as the Foundation for Heart Allocation Reform. J Card Fail. 2026 Sep; 32(9):1584-1593.
PMID: 42710972
Disparities in Listing With a Durable Left Ventricular Assist Device After 2018 Heart Allocation Policy Change.
Disparities in Listing With a Durable Left Ventricular Assist Device After 2018 Heart Allocation Policy Change. JACC Heart Fail. 2026 Aug 03; 103241.
PMID: 42554539
Improvements in survival after delisting without transplant signal potential data quality issue.
Improvements in survival after delisting without transplant signal potential data quality issue. Am J Transplant. 2026 Aug 03.
PMID: 42546904
Undercapture of HeartMate 3-Supported Pediatric Candidates in the OPTN STAR Registry.
Undercapture of HeartMate 3-Supported Pediatric Candidates in the OPTN STAR Registry. Ann Thorac Surg. 2026 Jul 17.
PMID: 42468869
Slow Life Support for Imminently Dying Patients.
Slow Life Support for Imminently Dying Patients. JAMA. 2026 Jul 07; 336(1):17-18.
PMID: 42268637
The future of heart transplant data science requires common data models.
The future of heart transplant data science requires common data models. J Heart Lung Transplant. 2026 Jun 27.
PMID: 42364792
Potential Impact of the OPTN Status Escalation Policy for Adult Heart Transplant Candidates With Durable LVADs.
Potential Impact of the OPTN Status Escalation Policy for Adult Heart Transplant Candidates With Durable LVADs. Circ Heart Fail. 2026 Jul; 19(7):e013854.
PMID: 42335275