Joshua A. Frieman Biography

Frieman helps lead the Dark Energy Survey as it begins observing the southern sky to measure supernovae, galaxy clustering, weak lensing and galaxy clusters.

Frieman's Dark Energy Survey collaboration releases first-year multi-probe cosmology results that test matter clustering and the standard dark-energy model with unprecedented survey data.

The Dark Energy Survey publishes its first major Type Ia supernova cosmology analysis, extending independent measurements of cosmic expansion beyond the original discovery samples.

The Dark Energy Survey releases year-three galaxy clustering and weak-lensing results, providing powerful tests of the standard cosmological model and dark-energy parameters.

The Dark Energy Survey publishes its final baryon acoustic oscillation distance measurement, adding an independent geometric probe of late-time expansion and dark energy.

The full six-year Dark Energy Survey combines multiple probes to place stringent constraints on models in which the dark-energy equation of state changes with time.