Alan Greenspan, the former chairman of the Federal Reserve who served for 19 years under four US presidents, has died at the age of 100.

His death was confirmed by his wife, journalist Andrea Mitchell, who notified NBC News of the passing on Monday.

Greenspan’s tenure as Fed chair, spanning from 1987 to 2006, made him one of the most recognizable and debated figures in global finance.

He guided the US economy through the 1987 stock market crash, the tech boom of the 1990s, and the early years of the 21st century.

His approach to monetary policy, often characterized by a reliance on market signals and a cautious stance on regulation, left a lasting imprint on how central banks operate.

The former chairman’s legacy is complex.