Charles 'Chuck' Geschke, co-founder of Adobe and developer of PDFs, dies at age 81 Top Searches Charles 'Chuck' Geschke, co-founder of Adobe and developer of PDFs, dies at age 81 AP / Updated: Apr 18, 2021, 11:08 IST FacebookTwitterLinkedinEMail Dr. Charles M. Geschke, president, co-chairman and co-founder of Adobe Systems Inc. CALIFORNIA: Charles "Chuck" Geschke - the co-founder of the major software company Adobe Inc. who helped develop Portable Document Format technology, or PDFs - died at age 81. Geschke, who lived in the San Francisco Bay Area suburb of Los Altos, died Friday, the company said. "This is a huge loss for the entire Adobe community and the technology industry, for whom he has been a guide and hero for decades," Adobe CEO Shantanu Narayen wrote in an email to the company's employees.