Joshua Simon Bloom (born June 8, 1974 in Washington, D.C.) is an American astrophysicist, full professor of astronomy at the University of California, Berkeley, and was the CTO and co-founder of the machine-learning company wise.io (acquired by General Electric, 2016). He received a Bachelor of Arts in astronomy and astrophysics and physics from the Harvard College in 1996, an M.Phil from Cambridge University in 1997, and a PhD in astronomy from the California Institute of Technology in 2002. He was a Junior Fellow of the Harvard Society of Fellows from 2002 to 2005. His astronomy research focuses on gamma-ray bursts and other astrophysical transients such as supernovae and tidal disruption events. He is author of the book What Are Gamma-Ray Bursts? published by Princeton University Press in 2011.