It\u2019s not easy to learn how to use computers when you can\u2019t actually touch them. But that\u2019s how Dr. Clarence Ellis started his career of invention\u2014which would ultimately lead to reimagining how we all worked with computers and each other. \n\nMartez Mott describes the \u201cMother of all Demos\u201d that would inspire a generation of builders. Gary Nutt recounts working with Dr. Clarence Ellis at Xerox PARC, and the atmosphere at the coveted research lab. Chengzheng Sun and Paul Curzon explain how Operational Transformation\u2014the project to which Dr. Ellis devoted so much time and effort\u2014laid the foundation for the collaborative tools many of us use every day. And Delilah DeMers shares how humble her father was, and how he loved teaching people that technology can be a force for good.