Donna Murphy 
Marlowe-Shakespeare Continuum [PDF ebook] 
Christopher Marlowe and the Authorship of Early Shakespeare and Anonymous Plays (Second Edition)

For those who doubt that the actor from Stratford, William Shakspere, wrote the works of Shakespeare, the brilliant poet and playwright Christopher Marlowe has always been the professional candidate. In this book, which argues that a chronological approach is essential, Donna N. Murphy employs a variety of tools to document a Marlowe-Shakespeare continuum (with her proposed dates of first-version authorship) in The Taming of the Shrew, c. 1590; II and III Henry VI, c. 1590; Edward III c. 1590-1; Titus Andronicus c. 1591-3; Thomas of Woodstock c. 1593; Romeo and Juliet c. 1595-6; and I Henry IV, c. 1596-7. Her research firmly supports the theory that Christopher Marlowe, living on after he supposedly died, was the main hand behind the works of Shakespeare.