The co-founder of Adobe and one of the co-developers behind the popular (and revolutionary) PDF file format, Dr. Charles Geschke, has died at the age of 81 according to a press release from the company. Photo by Tranmautritam from Pexels. Striking out with a fellow employee of Xerox, Dr. John Warnock, Geschke was Adobe’s chief operating officer from December 1986 to July 1994 and then the company’s President from April 1989 to April 2000. Geschke served as chairman of the board alongside Warnock from September 1997 until January 2017 and as a regular board member from that point until AprilThe co-founder of Adobe and one of the co-developers behind the popular (and revolutionary) PDF file format, Dr. Charles Geschke, has died at the age of .

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