London Guardian 
October 23, 2013
A senior White House national security official has been fired after being unmasked as the voice behind a Twitter account that embarrassed the Obama administration by aiming stinging criticism at government figures.
As director of nuclear non-proliferation, Jofi Joseph was helping to negotiate nuclear issues with Iran. But for more than two years, he also sent hundreds of tweets, many of them containing personal insults, using the Twitter handle @NatSecWonk.
In his Twitter biography, which has being been taken down, Joseph described himself as a “keen observer of the foreign policy and national security scene” who “unapologetically says what everyone else only thinks”.
In one tweet, he said: “‘Has shitty staff.’ #ObamaInThreeWords.” In another, he made fun of a top aide of Hillary Clinton’s choice of husband, who was then a Ccongressman, comparing their partnership unflatteringly to two senior White House officials.