the first person to see you had presidential possibilities i'm told was bart giamatti. >> so it's told. (laughs) he didn't tell me at the time. >> rose: behe told me he thought you shouldn't stay in a job as executive more than eight to ten years because pretty soon you'll start simply hashing what you had already done. you stayed 20 years. >> well, i got different advice. i actually got wonderful advice from hen i have shaft who had been the c.e.o. for 23 years. and wonderful man. and one of my trustees when i started at yale. i asked him how did he last 23 years at one company and he said you have to -- every five to seven years you have to complete rethink your agenda. if you don't have new ideas, if you don't have a new set of objectives it's time go. >> and it is in a fact incumbent on you to say how do you reseed, how do you rethink only analyze what you've been and where -- what you're doing. why did you at stanford study economics? >> i actually studied history as an undergraduate. >> rose: oh, you did? >> and got to oxford and did political theory and philosophy and only then