Connecting Readers and Writers discussion

Because several authors were kind enough to answer my previous questions, I wanted to thank them with more questions. You only have yourselves to blame! ;) Thanks for being so helpful.

Please give me your definitions, descriptions, and expectations of the following positions:

Editor

Proofreader

Beta-Reader

Reviewer

Copywriter

And is there such a thing as post-production tech, like someone who formats a book for e-publishing in different formats? If so, please describe.

Thanks again for your help!

Henry defined them quite nicely already, so I'll merely say, "What he said."

Henry: AMAZING response, thanks!
Does everyone agree with Henry's assessment?