Mary Lyon, the founder of Mount Holyoke Female Seminary, was Principal of the school from 1837 until her death in 1849. Her successors as Principal were Mary C. Whitman (1849-1850), Mary W. Chapin (1850-1865), Sophia D. Stoddard (Acting Principal, 1865-1867), and Helen M. French (1867-1872). In 1888, Elizabeth Blanchard, who had served as Principal since 1883, was named Acting President when Mount Holyoke's charter was changed to allow the school to grant degrees. Mary A. Brigham was elected President in 1889, but died in a railway accident on the way to assume her duties. Louise F. Cowles was Acting President until Elizabeth Storrs Mead became the first non-alumna President of the College in 1890. Her successor, Mary Emma Woolley, was elected President in 1900, took office in 1901, and served until 1937. In a controversial appointment, Roswell Gray Ham then became Mount Holyoke's first male President. His successor, Richard Glenn Gettell, was President until his resignation in 1968. Academic Dean and history professor Meribeth E. Cameron, who had served as Acting President when Presidents Ham and Gettell were on leave in 1954 and 1966, filled that office once again until David B. Truman became President in 1978. His successors as President have been Elizabeth T. Kennan (1978-1995) and Joanne V. Creighton (1996-present). History professor Joseph J. Ellis was Acting President for the spring semester in 1984 when President Kennan was on sabbatical, English professor Peter Berek served as Interim President from June-December 1995, and psychology and education professor Beverly D. Tatum was Acting President for the spring semester in 2002 when President Creighton was on sabbatical.