Mimir spent many years lurking within our realm before being recognized in his true immortal form. He ascended to his place among the immortals of Avatar during the spring of 2008.
These days, Mimir spends most of his time alternately designing new death traps for you to enjoy, and sprucing up existing areas to take advantage of new tricks and features as they become available. When he's not busy building and/or retro'ing, Mimir has also been known to host a quest here and there.
Feel free to contact Mimir with any questions or problems you may have. While he may not always be able to help you directly, he will do his best to make sure that your issue is resolved in a timely manner.
Despite the wisdom that comes from being an immortal cleric, it's important to realize that Mimir IS still a giant after all. Be patient. He'll figure out how to help you eventually, even if it takes a few attempts.