I work for one of the companies on the list, and touch Haskell every now and then on the job - maybe it's because I worked with quite a few functional languages

I work for one of the companies on the list, and touch Haskell every now and then on the job - maybe it's because I worked with quite a few functional languages when I studied for my degree (Artificial Intelligence, started in 1998), but I really really enjoy it.