Regular readers know that Geoff has been one of the co-bloggers of this blog for the last year (it was first left in Geoff n Neil's capable hands when I was at the Edinburgh Festival). Due to his shameless self-publicity you'll also know that he and Neil are current Guinness World record holders for travelling around all of London's 275 tube stations in the fastest possible time.
He might not thank me for this, but he's the only person I know to be lampooned by Victor Lewis-Smith's TV page when one of his earlier attempts was televised - well done mate (managed to find the archived Evening Standard article here). "Wherever there are trains, there are nerds, but this programme introduced us to a new and more virulent strain: the Super Nerd".
Geoff's also the brains behind Tube Relief a mass charity tube challenge in aid of the London Bombings Relief Charitable Fund.
Anyway, Happy Birthday mate! You may also like to know that Geoff shares his birthday with Ebay who are exactly 10 years old today!