Joshua Frieman

Joshua Frieman is an American astrophysicist and cosmologist renowned for his leadership in major observational projects probing the fundamental nature of the universe. He serves as a senior scientist at the U.S. Department of Energy's Fermilab and a professor at the University of Chicago, where he is also the former director of the Kavli Institute for Cosmological Physics. His research has significantly advanced the understanding of dark energy and the cosmic acceleration of the universe's expansion.

Early life and education

Joshua Frieman completed his undergraduate studies in physics at Stanford University, earning a Bachelor of Science degree. He then pursued his doctoral research in astronomy and astrophysics at the University of Chicago, where he was advised by the prominent cosmologist Michael S. Turner. His early academic work laid the groundwork for his future contributions to theoretical and observational cosmology, focusing on the formation of large-scale structure and the properties of the cosmic microwave background.

Career and research

Following his Ph.D., Frieman held postdoctoral positions at the Stanford Linear Accelerator Center and the University of California, Berkeley. He joined the scientific staff at Fermilab, where he has played a pivotal role in designing and leading large-scale astronomical surveys. He was a founding member and served as the Director of the Dark Energy Survey, a major international collaboration that used the Victor M. Blanco Telescope at the Cerro Tololo Inter-American Observatory in Chile to map hundreds of millions of galaxies. His research utilizes multiple probes, including Type Ia supernovae, weak gravitational lensing, and baryon acoustic oscillations, to constrain the properties of dark energy and test theories of cosmology like the Lambda-CDM model. He has also contributed to the Sloan Digital Sky Survey and is involved in the preparatory work for the Vera C. Rubin Observatory.

Awards and honors

In recognition of his scientific leadership and contributions, Joshua Frieman was elected a Fellow of the American Physical Society in the Division of Astrophysics. He is also a Fellow of the American Association for the Advancement of Science. His work on the Dark Energy Survey has been recognized through numerous awards given to the collaboration, and he has been invited to deliver prestigious lectures at institutions like the Kavli Foundation and the Aspen Center for Physics.

Selected publications

* "Probing Dark Energy with Baryonic Acoustic Oscillations from Future Large Galaxy Redshift Surveys" (with others, in *The Astrophysical Journal*) * "First Cosmology Results using Type Ia Supernovae from the Dark Energy Survey: Constraints on Cosmological Parameters" (with the DES Collaboration, in *The Astrophysical Journal Letters*) * "Weak Lensing for Precision Cosmology" (review article in *Annual Review of Astronomy and Astrophysics*) * "The Dark Energy Survey" (overview in *Astroparticle Physics*)

Personal life

Joshua Frieman maintains a strong commitment to science education and public outreach. He has been involved with programs at the Adler Planetarium in Chicago and frequently gives public lectures on modern cosmology. He is married and has children.

Category:American cosmologists Category:University of Chicago faculty Category:Fermilab people Category:1959 births Category:Living people