Run I of the Large Hadron Collider, which ended in 2012, was an unequivocal success. The ATLAS and CMS experiments discovered the Higgs boson, and hundreds of measurements and searches expanded our knowledge of the Standard Model of particle physics. In the spring of 2015 the Large Hadron Collider resumed proton-proton collisions at nearly twice the center-of-mass energy of Run I. The increase to 13 TeV collisions presents new opportunities for discoveries of physics beyond the Standard Model as well as a new regime to study Standard Model processes. The ATLAS detector, one of two general purpose particle detectors at the LHC, underwent a number of technical improvements in preparation for the new running conditions and nearly 4 fb-1 of high quality data were recorded in 2015. I will review these improvements, as well as the results obtained from the 2015 running. I will also preview the physics analyses and detector improvements we are looking forward to in the rest of Run II.