Zerrakhi is one of several names I use on the Internet, originally a character in some stories I wrote a long time ago. There's more information on the blog.
How I got involved
Arrived at Math Puzzle Wiki via a comment Oscar left on Richard Wiseman's blog (clicked on name). Saw puzzles in need of solutions; thought it looked like fun.
My favourite puzzle on the site is around the world. It is both elegant and challenging.