please welcome ed williams and walter isaacson and matthew tanzer reno as our moderator. >> you got the middle seat. >> all right. i'm going to go about 15 minutes over time, time, just so you no. prepare yourself for know lunch. thank you for coming. appreciated. walter you have a new book coming out. it is called the innovators. it innovators. it is contractually obligated that i hold it up like this. it is a book that you started before you started writing about steve jobs. >> i started work on this book about 15 years ago, 20 years ago when i was doing digital media at finding and i was and i was surprised. i cannot figure out how the personal computer and the original mainframe peter started, who came up with a logical circuit motion and then how did the engine and develop. i thought, well it will be interesting to start gathering strength, while the people i have worked with bob and steve and bill who helped with the personal computer. instead of doing oral histories of interviews i put it aside when i ended up writing a book about steve jobs but that just made me more interested