Answer: Douglas Engelbart
Computer engineer, inventor and technology expert Douglas Engelbart is best known for his work in the field of early data processing and networking technology, and there is no better time to do that work to summarize as the demonstration he gave on 9 December 1
In a single demonstration, Engelbart showed the computer mouse, hypertext linkage, word processing, dynamic file linking, windows, efficient navigation and command input, graphics, real-time collaborative editing of documents, revision control and video conferencing, all via the oN-Line System (NLS) connected to each other. a complete computer hardware and software system. To be clear, Engelbart gave the demonstration to together with his colleagues from his research laboratory in Stanford, 30 kilometers away, the NLS system. Sitting in front of the audience, he was able to seamlessly communicate with his colleagues in the home lab, presenting real-time features to both the audience (such as the computer mouse) and the lab.  The group of about one thousand computer professionals was stunned by the demonstration – rightly so, because they had never seen anything like it before, and the individual elements of the system, such as videoconferencing and distributed collaboration, were not widely available decades later. To put the experience into context for a modern reader, it would be like a group of journalists appearing at a press conference today to hear about theoretical holographic technology instead of watching a few slideshows and listening to an hour-long conversation. How cool it, the presenter in holographic form would just walk on stage in front of them.
If you would like to take a look at the demo that Engelbart gave you, you can view the resulting recordings courtesy of the Doug Engelbart Institute on YouTube.