Don Simus has been banned for racking up several warnings in a row is this thread.
Although he has been a member since 2008 most his previous contributions have been to start threads that have to be closed due to his behavior.
http://boards.straightdope.com/sdmb/showthread.php?p=17933446#post17933446
http://boards.straightdope.com/sdmb/showthread.php?t=712394&page=6