John Maynard Keynes, 1st Baron Keynes  ( KAYNZ; 5 June 1883 - 21 April 1946), was a British economist whose ideas fundamentally changed the theory and practice of macroeconomics and the economic policies of governments. He built on and greatly refined earlier work on the causes of business cycles, and was one of the most influential economists of the 20th century and the founder of modern macroeconomics theory. His ideas are the basis for the school of thought known as Keynesian economics, and its various offshoots. During the Great Depression of the 1930s, Keynes spearheaded a revolution in economic thinking, challenging the ideas of neoclassical economics that held that free markets would, in the short to medium term, automatically provide full employment, as long as workers were flexible in their wage demands.
The British Government called on Keynes's expertise during the First World War. While he did not formally re-join the civil service in 1914, Keynes travelled to London at the government's request a few days before hostilities started. Bankers had been pushing for the suspension of specie payments - the convertibility of banknotes into gold - but with Keynes's help the Chancellor of the Exchequer (then Lloyd George) was persuaded that this would be a bad idea, as it would hurt the future reputation of the city if payments were suspended before it was absolutely necessary. In January 1915, Keynes took up an official government position at the Treasury. Among his responsibilities were the design of terms of credit between Britain and its continental allies during the war, and the acquisition of scarce currencies. According to economist Robert Lekachman, Keynes's "nerve and mastery became legendary" because of his performance of these duties, as in the case where he managed to assemble - with difficulty - a small supply of Spanish pesetas. The secretary of the Treasury was delighted to hear Keynes had amassed enough to provide a temporary solution for the British Government. But Keynes did not hand the pesetas over, choosing instead to sell them all to break the market: his boldness paid off, as pesetas then became much less scarce and expensive. On the introduction of military conscription in 1916 he applied for exemption as a conscientious objector, which was effectively granted conditional upon continuing his government work. In the 1917 King's Birthday Honours, Keynes was appointed Companion of the Order of the Bath for his wartime work, and his success led to the appointment that would have a huge effect on Keynes's life and career; Keynes was appointed financial representative for the Treasury to the 1919 Versailles peace conference. He was also appointed Officer of the Belgian Order of Leopold.

Q: What was John  role in first world war?
A: Keynes travelled to London at the government's request a few days before hostilities started.

Q: How did he help the British?
A: In January 1915, Keynes took up an official government position at the Treasury.
Which people were there to help him in the process?
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