After 16 years, Sam Nunn is bowing out as chief executive of the Nuclear Threat Initiative, the anti-proliferation group he helped create after his lengthy career in the U.S. Senate, it was announced this morning.

Replacing the 78-year-old Nunn will be Ernest Moniz, former U.S. secretary of energy during the Obama administration. Nunn will remain involved as one of three co-chairmen on the NTI board. The other two will be Moniz and Ted Turner, the Atlanta-based cable TV pioneer.

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