Dan Bricklin, co-creator of Visicalc the first spreadsheet for the personal computer, was born in  Philadelphia, Pennsylvania, USA, on July 16, 1951.

VisiCalc helped to make the Apple, for which it was initially written, a success and also has a big impact on the IBM PC  as people bought personal computers simply to run VisiCalc.

It was Bricklin's partner in Software Arts, Bob Frankston, who gave VisiCalc its name. Bricklin's suggestion for the application that he devised was "Calcu-Ledger", which while not as good a product name was a fairly accurate description of what his program does. 

Dan Bricklin, born July 16, 1951

Philadelphia, Pennsylvania, USA

For more see:

Dan Bricklin - inventor of the PC spreadsheet