Albert Einstein (1879-1955), Swiss-German physicist (centre) and 29th US President Warren Harding (1865-1923) with a group of people outside the White

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Albert Einstein (1879-1955), Swiss-German physicist (centre) and 29th US President Warren Harding (1865-1923) with a group of people outside the White House, Washington DC, USA. Einstein received the 1921 Nobel Prize for Physics for work on the photoelectric effect. However, he is best known for his paper on the special theory of relativity, which resulted in the famous equation E=mc2. Harding was President of the USA from 1921 to his death in 1923.

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