John Arrington is a nuclear physicist and group leader of Medium-Energy Physics, Physics Division, at the Argonne National Laboratory. He is known for his leading role in a number of important nuclear physics and medium-energy/high-energy experiments at the Argonne and Jefferson National Laboratory Accelerator Thomas Jefferson National Accelerator Facility facilities. He is perhaps one of the most active and most cited young nuclear physicists in the world, with more than 8000 citations to his work and an H-index of 51.