Re/code:

Twenty-five years ago today, a software application called Photoshop arrived, promising photographers and graphic designers a new realm of digital possibilities. But my brother John Knoll and I didn’t realize at the time just how broadly influential our little piece of software would become.

When I began writing the code back in graduate school instead of focusing on my PhD at the University of Michigan, I had no idea what it would become or how it would be used.

Photoshop might be the most complicated software application I’ve ever used. It’s an amazing tool.