Last month marked the 40th anniversary of the Apple Lisa. The Lisa was an important evolutionary link in the history of the personal computer between the innovations at Xerox's PARC laboratory where the graphical user interface (GUI) was first conceived, and the modern GUIs that we are familiar with today. Released in 1983, the Lisa predated the Macintosh by a year and Windows by almost three years. Yet, the Lisa was a commercial failure. In this episode we discuss the Lisa's features, the reasons for its failure, and its legacy today.