Joint Chiefs of Staff Chairman on Why He Tweets: His Wife Reminds Him Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email Navy Adm. Mike Mullen, Chairman of the Joint Chiefs of Staff, talking to John Hockenberry at the Pentagon on Wednesday. ( Jim Colgan/The Takeaway / WNYC ) Produced by PRI and WNYC