Lambda the Ultimate

Mark Wooding studied mathematics and computer science at university. After a three-year spell as a sysadmin, he now works as a software engineer and cryptographer at nCipher. He lives in Cambridge, UK. He hacks on free software in his spare time.

Dynamic languages (e.g., Lisp, Python, Tcl);
History and evolution of languages (and computer systems generally);
Run-time systems (particualarly garbage collection);
Metaprogramming and macros;
Security, static analysis;
Functional programming;
Object orientation (particularly multiple inheritance, multiple dispatch);
Heavy metal music. (Oh, you wanted relevant interests. ;-) )

(Note that interest doesn't necessarily imply competence.)