Colin Wallace is currently a Ph.D. student in the Department of Astrophysical and Planetary Sciences at the University of Colorado at Boulder. Before focusing on astronomy education research, he worked on modeling entropy production inside black holes. His current research focuses on uncovering introductory astronomy students' conceptual difficulties with cosmology. He is also co-authoring a new suite of lecture-tutorials on cosmology topics such as the Big Bang, dark matter, and Hubble's law.