One of the main objectives of the ATLAS experiment at the CERN Large Hadron Collider is to discover physics beyond the Standard Model. This talk will review the motivation for Supersymmetry (SUSY), survey the resultant pantheon of particles, and examine their predicted interactions and experimental signatures. A specific research program for SUSY searches in the semi-leptonic sector developed by the SUSY group at the University of Michigan will be also presented.