joining us now is jeff sonnenfeld.re this morning. >> thanks, becky. good to be with you. >> nobody knows corporate management better than you do. why don't we take a look back. tell us first of all what you think maybe the one or two best shake-ups were just in terms of where management success is headed in a company. >> some of the changes that were kind of interesting, is companies like yahoo! ibm and hp. to all be headed by truly brilliant experienced women who have earned their stripes. we can talk about how each is doing on the job, but it is quite a break through year to have these technology titans let by such accomplished leaders. but i would say the moves at apple, as tim cook has found his oats and a critical top lieutenant under jobs was a bold move and widely celebrated, but not initially understood. jenny romini at ibm, it is an incredible story. they've had, you know, a little bit of market disappointments most recently. but it's been a tremendous story. they know what they're doing there. she has been t