ATLAS Status and latest results

The ATLAS experiment is a general-purpose detector located in one of the four interaction points of the Large Hadron Collider at CERN, Switzerland. In 2010 LHC has been colliding proton beams at the unprecedented centre-of-mass energy of 7 TeV. The last month of operation was dedicated to Pb-ion collisions at centre-of-mass energy of 2.76 TeV per nucleon. In this talk, a survey of the status of the ATLAS detector in both runs will be presented. The main results in pp collisions, including the study of minimum bias events, jets, W/Z, top and first searches for new physics will be reviewed. First results from heavy Ion collisions will be focussed on charged particle multiplicity, transverse energy, and elliptic flow as a function of collision geometry.