Post Keynesian economics is a school of economic thought with its origins in The General Theory of John Maynard Keynes

John Maynard Keynes

John Maynard Keynes, Baron Keynes of Tilton, CB FBA , was a British economist whose ideas have profoundly affected the theory and practice of modern macroeconomics, as well as the economic policies of governments...

, although its subsequent development was influenced to a large degree by Michał Kalecki, Joan Robinson

Joan Robinson

Joan Violet Robinson FBA was a post-Keynesian economist who was well known for her knowledge of monetary economics and wide-ranging contributions to economic theory...

, Nicholas Kaldor

Nicholas Kaldor

Nicholas Kaldor, Baron Kaldor was one of the foremost Cambridge economists in the post-war period...

 and Paul Davidson

Paul Davidson (economist)

Paul Davidson is an American macroeconomist who has been one of the leading spokesmen of the American branch of the Post Keynesian school in economics...

. Keynes's biographer Lord Skidelsky writes that the Post Keynesian school has remained closest to the spirit of Keynes's own work.
The term Post Keynesian was first used to refer to a distinct school of economic thought by Eichner and Kregel (1975) and by the establishment of the Journal of Post Keynesian Economics in 1978.