Seokyoon "Yoon" Chang is a senior at the College of Arts and Sciences majoring in Mathematical Biology. He has been interested in utilizing theoretical methods to explore and predict various ecological and evolutionary species interactions. He developed this interest through several research experiences by exploring the interaction of nematode parasitism and rhizobia mutualism in the Medicago truncatula system and investigating the role of host phenology and parasite co-infection in the evolution of virulence.