Ralph Luker, author of A Southern Tradition in Theology and Social Criticism, 1830-1930: The Religious Liberalism and Social Conservatism of James Warley Miles, William Porcher DuBose, and Edgar Gardner Murphy. Mellen Press (1984) Hardcover: ISBN 0-88946-655-6, ISBN 978-0-88946-655-5.
Luker, Ralph E. The Social Gospel in Black and White: American Racial Reform, 1885-1912 (1998).
Ralph Luker founded the Cliopatria history group blog on the History News Network of George Mason University's Center for History and New Media.
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Ralph Luker has questioned whether King's professors at the Crozer Theological Seminary held him to lower standards because he was an African-American, citing as evidence the fact that King received lower marks (a C+ average) at the historically black Morehouse College than at Crozer, where he was a minority being graded mostly by white teachers and received an A− average.