Population Health Epidemiology | Informatics | Climate & Health

Peter Graffy, PhD, MPH

I build epidemiologic and informatics tools that link clinical, environmental, and geospatial data to measure health risks and support better decisions for patients, communities, and climate-vulnerable workforces.

Peter Graffy

Pulmonary & Critical Care Postdoctoral Fellow

Center for Computational Medicine and Clinical Artificial Intelligence, University of Chicago

  • Co-founder, Straia Health
  • Luther College
  • University of Wisconsin-Madison
  • Northwestern University

About

Computational public health, grounded in real-world clinical data.

I am a pulmonary and critical care postdoctoral fellow in the Biological Sciences Division at the University of Chicago, a prior American Heart Association predoctoral fellow in Preventive Medicine at Northwestern University, and co-founder of Straia Health.

My work focuses on electronic health record linkage for population health surveillance, dynamic risk prediction, and machine learning methods that make clinical and environmental data more useful. I have built computer-aided detection and geolinkage tools that use protected health information in HIPAA-compliant workflows to improve individual and community health outcomes.

Through Straia, I am helping develop climate-health intelligence products, including HeatScope, to quantify environmentally driven health risk and help organizations act earlier. My dissertation evaluated the impact of climate change-related extreme heat in Chicago through community-level assessment and individual-level computational phenotypes integrating EHR and ecological data.

01

Climate & health

Extreme heat exposure, cardiovascular vulnerability, and public health surveillance.

02

Clinical AI

Phenotyping, risk prediction, and automated tools for clinically meaningful measurement.

03

Geospatial linkage

Privacy-preserving workflows connecting health encounters with place-based context.

04

Climate-health products

Applied tools that translate environmental hazard forecasts into timely health-risk action.

Projects

Tools and analyses for clinical, climate, and community data.

Company & Product

Straia Health & HeatScope

As co-founder of Straia Health, I help develop intelligence tools for environmentally driven health risk. HeatScope combines climate data, observed health outcomes, structural risk factors, and modeling to help teams understand where extreme heat may drive excess deaths, emergency visits, and EMS calls.

  • Advanced heat-health intelligence
  • Community-level aggregated data with no PHI
  • Decision support for earlier interventions

Climate Data Tool

Daymet DeGAUSS Tool

A Docker-based geospatial linkage tool for connecting geocoded patient encounters with Daymet surface weather and climate variables at 1 km resolution.

  • Designed for large encounter datasets
  • Works with HIPAA-compliant DeGAUSS architecture
  • Supports R and Python research workflows
Explore the tool

Computational Phenotyping

Heat and Hearts

An exposure-anchored framework for identifying cardiovascular vulnerability during extreme heat using linked environmental exposures and EHR-derived outcomes.

  • Published in Journal of Biomedical Informatics
  • Centers exposure timing in phenotype construction
  • Designed for climate-health surveillance
Read on PubMed

Civic Data

Chicago Crime Map

An interactive Shiny app mapping Chicago crime reports for northern wards, built for neighborhood-level exploration by type, date, and location.

  • Uses Chicago Data Portal records
  • Supports interactive map review
  • Includes companion trend summaries

Publications

Selected recent publications.

Media & Mentions

Coverage and public references to my work.

CBS News Chicago | 2025

Northwestern researchers' tool measures communities' heat vulnerability

Coverage of heat-vulnerability research and tools for identifying communities most at risk during extreme heat.

Read coverage

Inside Climate News | 2025

Chicago's deadly heat wave and the continuing roots of vulnerability

Reporting that cites heat-risk evidence in the context of systemic vulnerability, housing, and public-health preparedness.

Read coverage

Chicago Sun-Times | 2025

Northwestern heat research in Chicago coverage

Coverage connecting Chicago heat planning and policy discussions with Northwestern research on extreme heat and health risk.

Read coverage

City Bureau | 2026

How and where to stay cool in Chicago

Public-service reporting on cooling resources and extreme-heat response during dangerous summer conditions.

Read coverage

SmartCitiesWorld | 2026

Chicago invests in park cooling upgrades to tackle extreme heat

Coverage of Chicago's heat adaptation investments and the use of heat-vulnerability evidence to guide public infrastructure.

Read coverage

WTTW | 2023

Examining effects of extreme heat in Chicago's Black communities

Public-media discussion of unequal heat exposure, neighborhood vulnerability, and the health implications of extreme heat.

Read coverage

WBUR Here & Now | 2023

Heat wave mapping

National radio coverage of mapping heat risk and using spatial evidence to understand where climate hazards become health hazards.

Read coverage

NIH Research Matters | 2020

Artificial intelligence predicts heart disease risk from CT scans

NIH coverage of imaging-AI research using routine CT scans to predict cardiovascular disease risk.

Read coverage

Medical Imaging Coverage | 2018-2020

Automated CT biomarkers and clinical AI

Additional coverage of CT-based biomarkers for cardiovascular events, fatty liver disease, and aortic calcification.

Beyond Work

Still chasing hard efforts.

Outside of research, I spend most of my time being active, coaching or playing sports, and with family and friends. I played collegiate soccer and was an internationally recognized ultimate frisbee player with multiple national championships. I now compete in fitness races such as CrossFit and Hyrox, with my sights set on a sub-9H Leadville 100 MTB race.

Peter Graffy playing ultimate frisbee Peter Graffy at a Hyrox event

Contact

Interested in climate-health data, clinical AI, or collaboration?

petergraffy@gmail.com