Megginson, William was born on July 30, 1869 in Greenville, Tennessee, United States. Son of John Thomas and Sarah E. (Smith) Megginson.
Graduate Presbyterian Seminary of Kentucky, 1897, post-graduate same, 1901.
Ordained ministry, Presbyterian Church United States, 1897. Pastor Utica Church, San Antonio, Texas, 1897-1901, Elizabethtown, Kentucky, 1902-1905. District superintendent S.S. work of Southern Presbyterian Church, 1905-1909.
Pastor 1st Church, Biloxi, Mississippi, 1909-1914. Dean of Assembly’s Training School for Lay Workers, Richmond, Virginia, 1914-1918, also, professor Christian doctrine and O.T. history, same. Superintendent.