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**Title:** The Next Frontiers of Particle Physics: Linking Theory, Experiment, and Other Disciplines **Abstract:** Particle physics stands at a pivotal moment. While high-energy colliders have long been the primary tool for discovery, new ideas and technologies are opening complementary paths. In this talk, I will survey some of the most pressing open questions in particle physics, including the nature of dark matter and the possible existence of axions. I will highlight recent developments that bridge theory with experiment, such as the DarkQuest beam-dump experiment at Fermilab (that I started developing as a postdoc at Perimeter), novel dark matter detection strategies using condensed matter systems, and the potential of quantum sensing and gravitational wave observatories to probe dark sectors. This interdisciplinary perspective reflects a broader shift in the field: breakthroughs are increasingly likely to emerge from the interplay of particle physics with other disciplines. I will also reflect on my own journey, from a postdoc at Perimeter Institute to a professor leading a research group at the University of California, Santa Cruz, emphasizing how creativity, cross-field connections, community engagement, and mentoring are shaping the next frontiers of discovery.