Hui Li, a physicist at Los Alamos National Laboratory, presents this Institute for Advanced Study astrophysics seminar on the magnetic instabilities that may power the most energetic radiation seen from black hole jets. He argues that kink instabilities, driven by the large electric currents these jets carry, dissipate magnetic energy in ways that could explain flaring gamma ray emission reaching into the TeV and even PeV range, as observed from galactic microquasars like SS 433. Li walks through 3D magnetohydrodynamic simulations showing how kink instabilities generate turbulence and produce the polarization patterns recently measured by the IXPE telescope, including evidence for coherent magnetic fields stretching several parsecs along the jet. He compares this kink-driven turbulence to standard Alfvenic turbulence and describes how particles get accelerated within it. The talk closes by weighing what these simulations mean for understanding real astrophysical jets and the lobes they inflate. The audience is specialists, and the talk assumes familiarity with MHD and plasma astrophysics.