Graham Everest was one of the 27 signatories to the 2002 Estelle Morris letter but is not a noted activist in the creationist movement.
Everest is Professor of Mathematics at the University of East Anglia, Norwich. Here are some links involving him:
Faculty webpage, School of Mathematics, University of East Anglia. http://www.mth.uea.ac.uk/people/gre.html
Homepage, School of Mathematics, University of East Anglia. http://www.mth.uea.ac.uk/~h090/
Publications of Graham Everest, Norwich http://www.mth.uea.ac.uk/~h090/pubs.html
His testimony appears in On the Seventh Day: Forty Scientists and Academics Explain Why They Believe in God, edited by John F. Ashton, Ph.D. Master Books, Inc., Green Forest, AR, 2002. ISBN 0-89051-376-7.