Renée Hložek

Renée Hložek (born 15 November 1983) is a South African cosmologist and Associate Professor of Astronomy & Astrophysics at the Dunlap Institute for Astronomy & Astrophysics at the University of Toronto. Her research focuses on theoretical and observational cosmology, including measurements of the cosmic microwave background, constraints on axion dark matter, Type Ia supernova cosmology, and the development of statistical methods for large astronomical surveys. She is a member of the Atacama Cosmology Telescope collaboration and the Simons Observatory, and serves as Spokesperson for the Vera C. Rubin Observatory Dark Energy Science Collaboration (DESC).Hložek is bisexual.

Hložek's research includes using cosmic microwave background data to constrain ultralight axion dark matter models, work that is among her most highly cited. She is also a member of the Simons Observatory collaboration. As part of her work on supernova cosmology with the Vera C. Rubin Observatory, she co-led the Photometric LSST Astronomical Time-series Classification Challenge (PLAsTiCC), a community data challenge for photometric supernova classification.