Dark Energy Survey Begins
Frieman helps lead the Dark Energy Survey as it begins observing the southern sky to measure supernovae, galaxy clustering, weak lensing and galaxy clusters.
Historical biography archive · Updated 2026-11-03
Joshua A. Frieman Biography and Timeline
Follow Joshua A. Frieman through 6 dated historical records for United States of America.
Joshua A. Frieman, historical timeline
A chronological timeline drawn from matching World History Database records.
6Distinct records
1 of 1Page
2013–2026Years on this page
2013
2017
DES Year One Cosmology
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.
2019
DES Supernova Cosmology Results
The Dark Energy Survey publishes its first major Type Ia supernova cosmology analysis, extending independent measurements of cosmic expansion beyond the original discovery samples.
2021
DES Year Three Combined Cosmology
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.
2024
DES Final BAO Measurement
The Dark Energy Survey publishes its final baryon acoustic oscillation distance measurement, adding an independent geometric probe of late-time expansion and dark energy.
2026
DES Six Year Dynamical Dark Energy Constraints
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.
Records, sources and methodology
These dates and descriptions come from the historical_events database. Exact duplicate records have been collapsed. Names are grouped by the country, Name 2 and Name 1 fields; records with missing Name 2 cannot be reliably assigned to an individual biography. Check the underlying sources before formal citation.