Here is quite an interesting account of the history of GUI
It all started with Douglas Engelbrat.
Douglas Englebart’s demonstration in 1968 amazed many people and overwhelmed many more. It opened people’s eyes to what could be possible in the future — a future where people all over the world collaborated on electronic documents displayed on computer screens and transmitted instantly over networks to other users. Such a future did not bode well for a company that had made its fortune selling photocopiers.