You may be interested in his homepage, or, since you're probably after some code, the page detailing his (limited) hacks.
Christophe is involved in cCLan as a stepping stone towards the LispOS replacement cirCLe; he was responsible for the SPARC/Linux support in SBCL, and is now one of the maintainers; projects beyond his SBCL-related ones include design of small utilities, and small tinkering on large projects. He claims that his lack of a surname and absence from YoungLispers is a historical accident.
Christophe spoke on SBCL design, implementation and future at the Libre Software Meeting 2002; the slides from his talk are available from his homepage; he keeps an infrequently-updated mostly-Lisp-related Weblog at Advogato.