James Callaghan (1912–2005), former Prime Minister of the United Kingdom
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Nixey Callahan (1874–1934), real name James Callahan, baseball pitcher and manager
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He is regarded as a world expert on Indian and Pakistani affairs, and was a personal advisor in the region to Prime Ministers James Callahan, Edward Heath and Margaret Thatcher, and advised U.S. Presidents Jimmy Carter, Ronald Reagan, George H.W. Bush and Bill Clinton.