A Democrat, he worked on the Senate Foreign Relations Committee advising then-chairman Joseph Biden and later as the principal foreign policy adviser to Senator Robert P. Casey Jr.
Jofi Joseph's wife, Carolyn Leddy, is a Republican staffer on the Foreign Relations Committee.
The Washington Post cited a former NSC official as saying "Joseph could be sarcastic and bitter, especially in regard to colleagues who were given higher-level positions that he did not think they were qualified for."
Time correspondent Michael Crowley who knew Joseph -- fired "for his snarky and sometimes bilious tweets" -- wrote in a recent piece that "in person he was nothing like his obnoxious Twitter persona."
"Over lunch or coffee he was less interested in trashing colleagues than in diving deep on Iranian centrifuge capacity or deterrence theory in a post-Soviet world," he wrote.
