What do you think of them?
I'm familiar with a few of them, mainly Marlowe-was-Shakespeare and Jonson-was-Shakespeare. As far as I'm concerned, both those ideas are bullshit. I mean, Marlowe? Good writer, dab hand at the old bloody-tragedy lark, not so much with the funny. And Jonson? Funny guy, fecking hilarious at times (anyone read Epicoene?), not to good at the old no one-leaves-the-stage-alive business.
Any other theories you've heard?