In the 30 years since the introduction of Lotus 1-2-3 very little seems to have happened when it comes to how spreadsheets look and work. When it launched on January 26, 1983, Lotus 1-2-3 was not the first spreadsheet; that title goes to VisiCalc. But since it became the killer app of the first IBM PC, it certainly ranks as one of the most important pieces of software ever. We connected with the developer of Lotus 1-2-3, Jonathan Sachs, to get his take on spreadsheets and the last three decades. Read on for the complete interview.