Cassell completed a undergraduate degree at the University of Alabama at Tuscaloosa.[1] She earned a M.S. and Ph.D. in microbiology at the University of Alabama at Birmingham (UAB).[1] Her 1973 dissertation was titled Experimental mycoplasma pulmonis infection in pathogen-free mice: pathogensis and immune response. Richard B. Johnston was her doctoral advisor.[2] By 1973, she was married to Ralph Cassell.[2]
She began her research and teaching career at UAB in 1973 as an assistant professor in the department of comparative medicine.[1] She was named Charles H. McCauley professor of microbiology in 1994 and served as chair of the department of microbiology from 1987 to 1997 and as of 2003 is a professor emerita.[1] By 2003, she was also professor in the department of pediatrics and the department of comparative medicine. She was a senior scientist at UAB's center for AIDS research, cystic fibrosis center, and multipurpose arthritis center.[1] Cassell joined Eli Lilly and Company in 1997 as vice president of infectious disease research.[1] In 2002, she was promoted to vice president for scientific affairs and distinguished Lilly research scholar for infectious diseases.[1] She is an elected member of the Institute of Medicine.[1] Cassell became a senior lecturer on global health and social medicine at the Harvard Medical School.[3] She is vice president for TB drug development at the Infectious Disease Research Institute.[3][4]
^ abCassell, Gail Houston (1973). Experimental mycoplasma pulmonis infection in pathogen-free mice: pathogensis and immune response (Ph.D. thesis). University of Alabama at Birmingham.
^ ab"Gail H Cassell". ghsm.hms.harvard.edu. 20 December 2019. Retrieved 2022-10-09.
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