Nick Calio is a lobbyist working directly for a corporation as opposed to working for a lobbying firm. He is the Senior Vice-President for Global Government Affairs at Citigroup.   In a review of Washington D.C.-based lobbyists The Hill wrote that, "Nick Calio, Citigroup Calio has long been one of the most respected lobbyists in town, so even the rise of the Democrats will not put a dent in his reputation."
- "Nicholas E. Calio", Wikipedia, accessed June 2007.
- "Calio, Nicholas", Open Secrets, accessed June 2007.
- "Best in the Business", The Hill, April 24, 2007.
- Board of Governors, Bryce Harlow Foundation, accessed February 16, 2010.
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