The man who invented PDF file format dies at 81
Adobe Inc. co-founder Charles 'Chuck' Geschke died at 81 in California. The man behind the much-popular PDF file format, Geschke, earned a doctorate from Carnegie Mellon University. He then went on to work for Xerox Palo Alto Research Center before founding Adobe. Geschke, along with the Adobe co-founder John Warnock, was awarded the National Medal of Technology by former US President Barack Obama in 2009.