Uh, no, sir. The myth that Xerox Parc came up with the Apple GUI is wrong. Many of the ideas from PARC did get incorporated in may GUIs, but PARC got a lot of their ideas from Doug Engelbart's Stanford Research Institute (SRI) including the computer mouse. Apple's GUI bears very little resemblance to SmallTalk on the Xerox Star.
Many of the Apple GUI elements were wholly original to Apple, including drop down menus, contextual menus, draggable windowing, the trashcan metaphor for discarding files, and dragging and dropping of documents onto application icons to invoke that icon to open the document. Steve Jobs also was completely responsible for inventing the graphical type faces on computers which lead to desktop publishing with What You See Is What You Get displays, which came out of his fascination with Calligraphy. He insisted that the Macintosh had to have fonts that would be beautiful and scalable, not just raster pixels in an eight-by-eight grid.
What did Xerox PARC have to do with the iPhone or the iPad, Mycroft? Building an OS based on UNIXtm for the NeXT computer and later for the Mac with OS X? The iPod? Forcing the music industry to sell digital music? Building the integrated Apple ecosystem? Original ideas that came from Xerox PARC? No way.