Is he or she responsible for the other covers?
The cover images for the most recent reprint of the original series (now published as Wild Cards I, II and III) were designed by Michael Komarck.
Although he's been responsible for the book covers, several of the individual stories have had had their own eBook illustrations commissioned by other artists including Hugo Award winning John Picacio.
And Mike S Miller for the omnibus fifth edition.
Michael Komarck, found it in http://www.wildcardsonline.com/ news.