Former U.S. Secretary of State George Shultz speaks during a Senate Armed Services Committee hearing on Capitol Hill in Washington, D.C., the United States, on Jan. 25, 2018. (Xinhua/Ting Shen)

Shultz is one of only two Americans to have held four different federal cabinet-level positions.

WASHINGTON, Feb. 7  -- George Shultz, who severed as U.S. secretary of state in the Ronald Reagan administration, died Saturday at the age of 100.

His death was announced on Sunday by the Hoover Institution at Stanford University, where Shultz had worked for more than three decades.

"Our colleague was a great American statesman and a true patriot in every sense of the word. He will be remembered in history as a man who made the world a better place," Condoleezza Rice, a former secretary of state and current director of the Hoover Institution, said in a statement issued by the Hoover Institution.

Shultz is one of only two Americans to have held four different federal cabinet-level positions.