Alan Greenspan presided over the Federal Reserve for 19 years under four presidents and mastered the art of obfuscation known as Fedspeak.

A market maestro to some, he was criticized by others—including himself—for having too much faith in self-regulating markets.

The influential economist died Monday from complications of Parkinson’s disease, said his wife of 29 years, NBC News correspondent Andrea Mitchell.

Alan Greenspan, who served on the Federal Reserve under four presidents, died Monday at the age of 100.

Alan Greenspan, the influential economist who led the US Federal Reserve for almost 19 years and helped steer the world's largest economy through periods of growth and crisis, has…