Mullio has taught since 2017 in the real estate department at the Sol Price School of Public Policy at the University of Southern California. She teaches the history of real estate development and urban planning with a focus on the past, present and future emphasizing architecture and design. For her classes she has organized guest lecturers that specialize in the fields of architecture, real estate development and city affiliations. Mullio also has taught the micro-seminar, Getting up to Speed: The Evolution of Los Angeles’s Built Environment, for incoming USC freshman students. Over the years, she has taught in-person classes and due to the pandemic circumstances she added teaching online classes in real estate, architecture and planning to her resume.