Hugh WilliamsTuna, Alexander2023-05-222001-01-012015-07-202015-01-012015-07-20https://repository.upenn.edu/handle/20.500.14332/27935This thesis presents evidence for Higgs decays to tau leptons with the ATLAS experiment at the Large Hadron Collider. Special emphasis is given to the VBF semi-leptonic category of the analysis. The data correspond to 25/fb of proton collisions with 7 or 8 TeV. Particle reconstruction at ATLAS is discussed, with additional detail given to hadronic tau lepton decays. The analysis search strategy, predictions, and results are described. Prospects for the analysis, both in the near- and long-term, are also discussed.183 p.application/pdfAlexander TunaHiggstausElementary Particles and Fields and String TheoryDissertation/Thesis