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Haig was born in Pennsylvania and had two siblings. His father died when he was young and he was raised by his mother. Haig went to college at Notre Dame University for two years before switching to the United States Military Academy. He later attended Columbia and Georgetown to get his masters. While in the army, he served in the Korean War in several major battles. He served as a commander in the Vietnam War. At one point, his helicopter was shot down and he saw two days of violent hand-to-hand combat. He was awarded the Purple Heart and Distinguished Flying Cross for his notable bravery in wartime.
In 1969, President Richard Nixon made him a national security advisor. Haig helped negotiate the ceasefire in the Vietnam War. Nixon promoted him to White House Chief of Staff after H. R. Haldeman resigned facing criminal charges. Haig has been praised by many people by keeping the government running during the Watergate scandal that brought down Nixon. Haig has even been called an "acting president" during the last days of Nixon's administration. When Nixon was forced to resign, Haig helped the new president Gerald Ford. He remained Chief of Staff during Ford's administration.
In 1974, Haig became Supreme Allied Commander of Europe, a job that made him the head of all NATO forces. In 1979 he survived an assassination attempt. In 1979, he retired from the army as a four star general. After this he was on the board of a number of companies. In 1981, Ronald Reagan appointed him as Secretary of State. In this new job, Haig was the head of US foreign policy. Haig believed that the US should take a strong stand against the Soviet Union.
In March 1981, Reagan was shot by John Hinckley, Jr., a mentally ill man in Washington DC. Vice President George Bush was on a plane, and Haig was put in charge of the government until Bush could be reached. He told reporters that "I am in control here." Reagan made a full recovery.
In 1982, after Argentina invaded the Falkland Islands, Haig tried to solve the crisis peacefully by bringing UK Prime Minister Margaret Thatcher and Argentinian dictator Leopoldo Galtieri to negotiate. No solution was reached and the crisis ended with the full blown Falklands War between the two countries. The British won the war, and Galtieri's regime collapsed. In July 1982, Haig retired from the State Department. Reagan nominated George Schultz as the new Secretary of State.
Haig ran for President in 1988, but George Bush beat him. Haig was involved in a number of businesses after leaving office. He also advised several presidents, who wanted his expertise in foreign policy. In 2006, President George W. Bush held a meeting of ten former State and Defense Secretaries. Haig was at the meeting. He published his memoirs in 1992.