John Mauchly was a legend of United State (US) and was born 30 August 1907 and died on 08 January 1980. When he has done studying he entered the profession of teaching and became a professor. He was an associate professor in the university of Pennsylvania. Mr. John with the help of Eckert successfully introduced a computer after the world war II which help store the data coded. In 1946 a huge computer machine came across. There are many successful stories of Mr. John and his inventions. Some of the examples are the BINAC and UNIVAC I. these two were the main inventions, and this is how computers and now laptops came across the main origin of all this was the scientist usually known as John William Mauchly.