Overview
Use observational tools to measure the expansion history of the universe. Trying to answer big questions like 'what is dark energy?'.
Current Appointments & Affiliations
Associate Professor of Physics
·
2023 - Present
Physics,
Trinity College of Arts & Sciences
Associate Professor in the Department of Electrical and Computer Engineering
·
2025 - Present
Electrical and Computer Engineering,
Pratt School of Engineering
Recent Publications
OpenUniverse2024: A shared, simulated view of the sky for the next generation of cosmological surveys
Journal Article Monthly Notices of the Royal Astronomical Society · October 23, 2025 AbstractThe OpenUniverse2024 simulation suite is a cross-collaboration effort to produce matched simulated imaging for multiple surveys as they would observe a common simulated sky. Both the simulated dat ... Full text CiteThe Perfect Host: JWST Cepheid Observations in a Background-free Type Ia Supernova Host Confirm No Bias in Hubble-constant Measurements
Journal Article Astrophysical Journal Letters · October 20, 2025 Cycle 1 JWST observations of Cepheids in Type Ia supernova (SN Ia) hosts resolved their red-giant-dominated near-infrared backgrounds, sharply reducing crowding and showing that photometric bias in lower-resolution Hubble Space Telescope (HST) data does no ... Full text CiteComparing the DES-SN5YR and Pantheon+ SN cosmology analyses: investigation based on ‘evolving dark energy or supernovae systematics’?
Journal Article Monthly Notices of the Royal Astronomical Society · August 1, 2025 Recent cosmological analyses measuring distances of type Ia supernovae (SNe Ia) and baryon acoustic oscillations (BAO) have all given similar hints at time-evolving dark energy. To examine whether underestimated SN Ia systematics might be driving these res ... Full text CiteRecent Grants
A Roman Project Infrastructure Team to Support Cosmological Measurements with Type Ia Supernovae
ResearchPrincipal Investigator · Awarded by National Aeronautics and Space Administration · 2023 - 2028Research in High Energy Physics at Duke University
ResearchCo Investigator · Awarded by Department of Energy · 2013 - 2028Big Data and the Biggest Tension in Cosmology
ResearchPrincipal Investigator · Awarded by David & Lucile Packard Foundation · 2019 - 2027View All Grants
Education, Training & Certifications
Johns Hopkins University ·
2013
Ph.D.
Massachusetts Institute of Technology ·
2007
B.S.