I work for BofA, but I'm pretty sure I'm the only one that uses Haskell.
I used Haskell because I hate Windows, and Haskell lets me do all my work in a maximized Emacs session without having to install anything other than Emacs and the Haskell Platform. "When life gives you Windows, don't make lemonade. Use Haskell."
Where do you work that uses Haskell in the office?