Mary Mason Lyon (February 28, 1797 - March 5, 1849) is an American pioneer in women's education.
She establishes the Wheaton Female Seminary in Norton, Massachusetts, (now Wheaton College).
Within two years, she raises $15,000 to build the Mount Holyoke School.
She also establishes Mount Holyoke Female Seminary (now Mount Holyoke College) in South Hadley, Massachusetts in 1837 and serves as its first president (or "principal") for 12 years.
Lyon's vision for Mount Holyoke fuses intellectual challenge and moral purpose.
She values socioeconomic diversity and endeavors to make the seminary affordable for students of modest means.