Stephen William Hawking (1942-2018) was an English theoretical physicist, cosmologist and the Lucasian Professor of Mathematics at Cambridge. He authored ‘The universe in a nutshell (2001) and ‘A brief history of Time’(2005). When he was doing his graduation at Cambridge, he was diagnosed with the motor neurone disease that gradually, paralyzed him with in a decade. After the loss of speech, he communicated through a speech generating device, in the beginning through the use of a handheld switch and at the end by using a single cheek muscle. Hawking was the first to set out a theory of cosmology explained by a union of the general theory of relativity and quantum mechanics.