I and my research group search for new particles at the energy frontier with the ATLAS Experiment at the CERN Large Hadron Collider and develop the real-time data-taking and analysis techniques that make those searches possible. One of my contributions to the LHC has been its search strategy for particle dark matter. My group is preparing for the High-Luminosity LHC, where an order-of-magnitude increase in the data challenge and event complexity will demand new approaches to triggering, reconstruction, and analysis.