Dr. Bei Zhou is currently a Postdoc in Kavli Institute for Cosmological Physics at the University of Chicago. Prior to this, he was a Postdoc (2020-2023) in the Department of Physics and Astronomy at Johns Hopkins University, collaborating with Prof. Marc Kamionkowski. He earned the Ph.D. (with Prof. John Beacom) from the Department of Physics at The Ohio State University (2015–2020), affiliating with the Center for Cosmology and AstroParticle Physics (CCAPP). Dr. Bei Zhou’s primary focus is on theoretical particle astrophysics and cosmology, with particular interests in neutrinos, gamma rays, and dark matter.High-energy neutrinos (>~ 100 GeV) are crucial for both astrophysics and particle physics. For example, they provide a unique tool to study the origin of HE cosmic rays and studying extreme astrophysical environments. They also offer great opportunities to study neutrino interactions and test physics in the Standard Model and beyond, as neutrinos guarantee new physics.  In this talk, I will present examples of the above aspects and will also present what is needed for the precision high energy neutrino astrophysics enabled by the upcoming telescopes.