John Maynard Keynes

was an English economist whose writings are considered the basis for the school of thought known as Keynesian economics, as well as its various offshoots.[7] Originally trained in mathematics, he built on and refined earlier work on the causes of business cycles.[8] His ideas, further developed after his death as New Keynesianism, are seen as foundational to mainstream macroeconomics. He has been referred to as the "father of macroeconomics"[9] and is considered one of the most influential economists of the 20th century.