I send Chistopher Knight and email, asking what's their policy on articles published somewhere else. 

 To be exact, I asked:

If I publish an article somewhere else, can I  submit it to Ezinearticles.com?

His very short answer:

Yes, provided it's under the same author name.

I felt compelled to make this post by the shear number of people who seem to think you must first publish in ezinearticles.com or else.