Gunnar Brown successfully defended his Ph.D. thesis titled "Development of complete ex vacuo IBA and its application to indoor and outdoor environmental dust samples" advised by Prof. Graham Peaslee on March 26, 2024. During his time at the nuclear science lab at Notre Dame, Gunnar performed extensive experiments to characterize the elemental composition of indoor and outdoor environmental dust samples. By utilizing the 9S accelerator as well as citizen science and social media, he conducted a project to investigate elemental pollution in homes across the state of Indiana. In addition, he worked to perform similar analyses on road-side dust collected from Northern Lake County, Indiana to investigate pollution from historical and current industrial activities in the area. He was also instrumental in developing the 9S facility into a high-throughput ion beam analysis laboratory and using the FN tandem to harvest long-lived radioisotopes that are medically useful. He has accepted a job with the Air Enforcement and Compliance Assurance Branch in Region 5 of the US Environmental Protection Agency in Chicago for the next stage of his career.