I tried netfind at a couple different nodes and couldn't find Christian Marck.
I also did a Wais search of the biosci archives and found that this question
is a common one. Unfortunately it is one that has gone unanswered. It has
been said by many that he doesn't respond to Snail mail or E-mail.
One address given was
Christian Marck? He is located at:
Service de Biochimie - Bat 142
Centre d'Etudes Nucleaires de Saclay
91191 GIF-SUR-YVETTE CEDEX FRANCE
Craig Marshall cjm at uk.ac.cam.mrc-lmb seemed to have been in contact
with him judging from the context of his post.
Best of luck,
Dan Jacobson