Atticus Stonestrom who is currently in his fourth year in the PhD program at Notre Dame was awarded a Simons Dissertation Fellowship in mathematics. Atticus was one of 40 award winners this past year. Atticus's research is concerned with mathematical logic, and more specifically in model theory, and his adviser is Anand Pillay. His project title is "Definable Groups in NIP and Simple Theories." Atticus will hold the fellowship for the next two years, and plans to use it in part to support travel to facilitate collaboration with other mathematicians. The list of award winners can be found at: https://www.simonsfoundation.org/2025/07/23/first-class-of-simons-dissertation-fellows-in-mathematics-announced/