John Warnock, who invented the PDF and co-founded Adobe Systems, dies at age 82

The Silicon Valley entrepreneur and computer scientist died Saturday surrounded by family, Adobe said in a statement. The company didn’t give a cause of death or say where Warnock died.

He earned an undergraduate in math and doctorate in electrical engineering, or computer science, from the University of Utah and maintained close ties with his home state after he retired as CEO of Adobe. He continued to be a self-described “mediocre” student as he earned his bachelor’s degree in mathematics and philosophy, but he made a mark while working on his master’s degree.

In the late 1970s, Warnock moved to Palo Alto, California, to work for Xerox on interactive computer graphics. There, he met Geschke and went to work developing InterPress, a printing and graphics protocol that they were convinced would be the wave of the future. When Xerox balked, they decided to create their own company.

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