Born: February 18, 1867, Harveysburg, Ohio.
Died: July 23, 1956, Arlington, Massachusetts.
Buried: Mount Auburn Cemetery, Cambridge, Massachusetts.
Marion was the son of George W. Ham and Marcia Emily Haynes.
He began his career as a journalist and bank clerk in Chattanooga, Tennessee.
Ordained a Unitarian minister in 1898, he served pastorates in Chattanooga (1898–1904); at the First Church, Dallas, Texas (1904–09); and in Reading (1909–34), Waverly (1934–42), and Gardner, Massachusetts (1943–45).
The Meadville Theological School, Chicago, Illinois, awarded him a Doctor of Divinity degree in 1942, the year he retired.