In 1989, Dr. Marshall graduated from Lubbock Christian University. From 1989 until 1992, she taught for the Lubbock Independent School District. After her daughter entered kindergarten she decided to attend graduate school. Five years later, Dr. Marshall graduated from TTU with a Ph.D. in chemistry. Currently, she teaches general chemistry and biochemistry. She also supervises the undergraduate research program in the Biochemical Research Lab, "the peanut lab."