David Rhys Williams wrote about what theory that Marlowe was the author of Shakespeare plays? 
David Rhys Williams: David Rhys Williams (1890 – March 28, 1970) was an American Congregational and Unitarian minister who wrote a Marlovian book called "Shakespeare Thy Name Is Marlowe". Marlovian theory of Shakespeare authorship: The Marlovian theory of Shakespeare authorship holds that the Elizabethan poet and playwright Christopher Marlowe was the main author of the poems and plays attributed to William Shakespeare. Marlovian theory of Shakespeare authorship:  Rather, the theory says Marlowe did not die in Deptford on 30 May 1593, as the historical records state, but that his death was faked.
Marlovian theory