Samuel Augustus Nunn Jr. is a prominent American politician and lawyer who served as a United States Senator from Georgia for 24 years. A member of the Democratic Party, he was a leading voice on national defense and foreign policy, serving as chairman of the powerful Senate Armed Services Committee. After retiring from the Senate in 1997, Nunn co-founded the Nuclear Threat Initiative (NTI), a non-profit organization dedicated to preventing catastrophic attacks with nuclear, biological, and chemical weapons. He remains an influential figure in discussions on national security, arms control, and public policy.