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Joshua Bloom

Co-founder & CEO of Valency · Professor of Astronomy

Valency

UC Berkeley

Welcome

Joshua Bloom is co-founder and CEO of Valency, a venture-backed company building infrastructure for agentic science. He is also an astronomy professor at the University of California, Berkeley, where he has taught radiative processes, high-energy astrophysics, astronomy data lab, and a graduate-level “Python for Data Science” course, and served as chair of the Astronomy Department. He has published over 350 refereed articles on time-domain transients events, AI, and telescope/insight automation. He co-founded the Berkeley Institute for Data Science (BIDS) and is a faculty member of the Berkeley Artificial Intelligence Research (BAIR) Lab. Josh has been awarded the Data-Driven Discovery prize from the Gordon and Betty Moore Foundation, the Pierce Prize from the American Astronomical Society, the Sloan Fellowship, a Junior Fellowship at the Harvard Society, and the Hertz Foundation Fellowship. He holds a PhD from Caltech and degrees from Harvard College and Cambridge University. Before Valency, he was co-founder and CTO of Wise.io, an AI application startup, acquired by GE Digital in 2016. His book on gamma-ray bursts, a technical introduction for physical scientists, was published by Princeton University Press.

Josh is the founder and principal curator of the CuratingAI art exhibition which ran in April 2024.

Note on Speaking Invitations: In the interest of fostering diverse representation, before inviting me to speak at a conference or the like, I ask that organizers pay particular attention to attracting women and those from underrepresented groups to be on the panel(s)/speaker list. I've served on too many academic and industry panels where the representation of such groups was nil or close to zero. If logistics work out, I'd be happy to participate so long as there are some assurances that it will be a diverse group on stage.

AI-generated podcast about a recent paper An Earth-mass planet and a brown dwarf in orbit around a white dwarf:

Joshua Bloom · WD_planet

Interests

  • Machine learning meets Physics
  • Time domain (Black hole transients, Gamma-ray bursts)
  • Optical/infrared instrumentation

Education

  • PhD in Astrophysics, 2002

    Caltech

  • MPhil in Astronomy, 1997

    Cambridge University

  • AB in Astrophysics and Astronomy and Physics, 1996

    Harvard College

Recent Publications

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Journal article arXiv e-prints Oct 2026

Multi-modal transmission forecasting for the Vera C. Rubin Observatory

Peter Xiangyuan Ma, Joshua S. Bloom
arXiv
Journal article arXiv e-prints Oct 2026

A Radiation-Hardened, Fault-Aware Quantized Neural Network That Self-Heals

Peter Xiangyuan Ma, Joshua S. Bloom
arXiv
Journal article Astrophysical Journal Letters Aug 2026

TDE 2025abcr: A Tidal Disruption Event in the Outskirts of a Massive Galaxy

Robert Stein, Jonathan Carney, Charlotte Ward … Joshua S. Bloom … +29 moreShow fewer
Robert Stein, Jonathan Carney, Charlotte Ward, Raffaella Margutti, Xander J. Hall, Itai Sfaradi, Igor Andreoni, Panos Charalampopoulos, Ryan Chornock, Suvi Gezari, Geoffrey Mo, Yuhan Yao, Akash Anumarlapudi, Eric C. Bellm, Joshua S. Bloom, Malte Busmann, Ilaria Caiazzo, S. Bradley Cenko, Matthew J. Graham, Steven L. Groom, Daniel Gruen, Erica Hammerstein, Benjamin C. Kaiser, Mansi M. Kasliwal, Brendan O’Connor, Antonella Palmese, Josiah Purdum, Jillian C. Rastinejad, Reed Riddle, Ben Rusholme, Jesper Sollerman, Jean J. Somalwar, Sylvain Veilleux
DOI
Journal article Publications of the Astronomical Society of the Pacific Jun 2026

BOOM and Babamul: A Real-time, Multi-survey, Optical Alert Broker System Operating at Scale

Theophile Jegou du Laz, Michael W. Coughlin, Peter Bachant … Joshua S. Bloom … +16 moreShow fewer
Theophile Jegou du Laz, Michael W. Coughlin, Peter Bachant, Jacob E. Simones, Thomas Culino, Antoine Le Calloch, Sushant Sharma Chaudhary, Xander J. Hall, Tyler Barna, Daniel Warshofsky, Matthew Graham, Mansi M. Kasliwal, Ashish Mahabal, Joshua S. Bloom, Antonella Palmese, Frank J. Masci, Steven L. Groom, Richard Dekany, Reed L. Riddle, George Helou
DOI
Journal article Astronomy and Astrophysics Jun 2026

ZTF-SEDm Type Ia supernova sample for Twins Embedding spectrophotometric standardization

C. Ganot, Y. Copin, M. Rigault … Joshua S. Bloom … +25 moreShow fewer
C. Ganot, Y. Copin, M. Rigault, G. Dimitriadis, A. Goobar, K. Maguire, J. Nordin, M. Smith, G. Aldering, C. Barjou-Delayre, M. Betoule, Joshua S. Bloom, U. Burgaz, L. Galbany, M. Ginolin, M. Graham, D. Hale, J. Johansson, M. M. Kasliwal, Y.-L. Kim, F. J. Masci, T. E. Müller-Bravo, S. Perlmutter, B. Popovic, J. N. Purdum, B. Rusholme, J. Sollerman, J. H. Terwel, A. Townsend
DOI

Recent Posts

Navier-Stokes and the Future AI Acceleration in Science

A partial resolution of a Millennium Prize problem is a milestone for frontier models in the “thinking” layer of science. But axiomatic reasoning, …

We will need more (not fewer) scientists

AI co-scientists are getting good at precisely the labor we trained to do. But the pursuit of knowledge is not a zero-sum game. Instead, as the scientific …

The Invisible Future of AI ✨

What can the Hubble Space Telescope and CCD sensors teach us about the visibility of AI in products and science?

The Implicit Digital Contract Between People That LLMs Are Disintegrating

This post originally appeared on Medium. There is a certain kind of tax on human attention that has always existed in digital communication. Spam filters …

The Last Programming Languages Created by People

Are Python, Go, and Rust humanity’s last hurrah?

Contact

  • 501 Campbell Hall, Berkeley, CA 94720
  • Enter Campbell and go to the second flow
  • DM Me