Charles Geschke was an American computer scientist and co-founder of Adobe Systems, a company known for its software products like Adobe Acrobat and Photoshop. He played a crucial role in the development of the Portable Document Format (PDF), which revolutionized document sharing and printing. Born on September 11, 1939, Geschke earned his Ph.D. in computer science from Stanford University. His contributions to the tech industry earned him numerous awards, including the National Medal of Technology and Innovation. Geschke's work has had a lasting impact on digital communication and document management.