Signatures (with affiliations) removed from the end of biography

I have removed Ed's and Ken's signatures from the bottom of the text of the biography. The impetus was a long-standing problem: Ken's affiliation was given as "College of William and Mary." In the years since this problem was noted, however, the need for the signature at the bottom has been obviated by the addition of the authors' names to the top of the page, so rather than update the affiliation I have removed the signature block from the end.

~ Brett