Mary Quintrell taught at Cleveland Central High School for more than a quarter century, and trained fellow teachers in her method of reading education. Quintrell developed an early
phonics-based approach to literacy, including a chart she devised. She also supported Bible reading in public schools. She ran for the Cleveland School Council in 1895. One local historian wrote of her work, "Cleveland has had no nobler, more generous and effective citizen than Miss Mary Corinne Quintrell." Quintrell was further involved in community literacy projects, especially at Lakeside Hospital, where she was a longtime volunteer, leading singing and providing books and magazines for patients. She was a founder and charter member of the
Cleveland Sorosis Society (organized 1891), and a longtime member of the city's Novelist Club. In 1893, she represented the Science Club of Cleveland at the
World's Columbian Exposition in Chicago. Quintrell "strongly favor[ed] woman suffrage" and wrote poetry for local publications. ==Personal life==