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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.

Absolute titan, Charles Geschke founder of Adobe and PDF file format , dead at 81. A mathematics teacher at John Carroll University . He in 1972, completed his PhD in computer science at Carnegie Mellon University . Geschke in a garage, co-founded Adobe in 1982. An inductee in the Association for Computer Machinery, as well as 2008 National Medal of Technology and Innovation, awarded by President Barack Obama. The American computer scientist was 81.

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